Brownies & BarsJapaneseMedium

Instant Pot Miso Butterscotch Bars

Name: Instant Pot Miso Butterscotch Bars
Prep time: 15 min
Cook time: 35 min
Total time: 50 min
Yield: 12 servings
Cuisine: Japanese
Ingredients: ½ cup (113 g) unsalted butter, softened, at room temperature; 1 cup (200 g) packed light brown sugar; 2 tbsp (36 g) white miso paste (shiro miso), at room temperature; 1 tsp (5 ml) vanilla extract; ¼ tsp (1½ g) kosher salt; 1 (50 g) large egg, at room temperature; 1 cup (120 g) all-purpose flour; 1 cup (170 g) butterscotch chips; 3 tbsp (43 g) unsalted butter; ¼ cup (50 g) packed light brown sugar; 1½ tbsp (27 g) white miso paste (shiro miso); 2 tbsp (30 ml) heavy cream; fleur de sel or sea salt, to taste

From the MyKitchenBank Kitchen

A Japanese-American fusion dessert featuring chewy butterscotch bars infused with savory white miso paste, creating a sophisticated sweet-salty flavor balance. Cooked in an Instant Pot using the water bath method, these bars are dense, buttery, and topped with a glossy miso butterscotch glaze. Perfect for those who love umami-forward sweets.

Prep: 15 min
Cook: 35 min
Wait: 25 min
Total: 1 hr 15 min
Makes: 12 bars

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Steps

Before you start

Bring butter to room temperature (1 hour ahead)
Line a 7×7-inch (18×18 cm) baking pan with parchment paper, leaving overhang on two sides
Add 1 cup (240 ml) water to the Instant Pot and insert the trivet
Read through the miso paste—it should be white or light yellow (shiro or awase), not dark red miso

1
Cream butter and sugar
- In a large mixing bowl, whisk together the softened butter (½ cup / 113 g) and packed brown sugar (1 cup / 200 g) until light and fluffy, about 3 minutes.
- The mixture should be pale and airy.
- This incorporates air into the batter, creating a tender bar.
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Ready when: Mixture is pale, fluffy, and takes 3 minutes of vigorous whisking
Tip: Use room-temperature butter—cold butter won't cream properly and will result in dense, tough bars.
2
Add miso and egg
- Add the white miso paste (2 tbsp / 36 g) to the creamed butter and sugar.
- Whisk until smooth and fully incorporated, about 1 minute.
- Then add the vanilla extract (1 tsp / 5 ml), kosher salt (¼ tsp / 1.5 g), and the room-temperature egg.
- Whisk until the mixture is smooth and emulsified, about 1 minute more.
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Ready when: Batter is smooth, glossy, and no streaks of miso or egg white remain
Tip: Whisking the miso thoroughly prevents pockets of salty paste in the finished bars.
3
Fold in flour and butterscotch
- Add the all-purpose flour (1 cup / 120 g) and fold it into the wet mixture using a rubber spatula until just combined—don't overmix or the bars will be tough.
- Fold in the butterscotch chips (1 cup / 170 g) gently until evenly distributed throughout the batter.
- The batter should be thick and studded with chips.
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Ready when: No dry flour streaks remain and butterscotch chips are evenly spread through the batter
Tip: Fold gently to avoid gluten development, which toughens the bars. A few flour streaks are fine; stop folding once chips are mixed in.
4
Transfer to parchment-lined pan
- Pour the batter into the parchment-lined 7×7-inch (18×18 cm) baking pan.
- Using the rubber spatula, spread the batter into an even layer, reaching into the corners.
- Pat gently to level the surface.
- The batter should fill the pan about ¾ of the way up the sides.
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Ready when: Batter is level and evenly spread across the pan bottom
Tip: The parchment overhang makes it easy to lift the finished bars out of the pan for cutting.
5
Wrap pan and prepare for Instant Pot
- Wrap the top of the baking pan tightly with aluminum foil (to prevent condensation from dripping onto the bars during cooking).
- Create a foil sling by tearing off two 16-inch-long sheets of foil and crisscrossing them under the pan (one under each side).
- This makes it easy to lower the pan into the pot and lift it out afterward.
- Make sure the Instant Pot already has 1 cup (240 ml) of water added and the trivet inserted.
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Ready when: Pan is fully wrapped and sling is in place; water is in the pot with trivet
Tip: The foil sling is essential—it prevents the pan from tipping as you transfer it and ensures safe removal of the hot pan.
6
Lower pan into Instant Pot
- Carefully lower the foil-sling-wrapped pan onto the trivet inside the Instant Pot.
- The pan should sit flat on the trivet with no tilting.
- Close the lid of the Instant Pot and set the valve to "Sealing."
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Ready when: Pan sits level on trivet; lid closes and seals
Tip: If the pan doesn't fit flat, your Instant Pot or pan size may be incorrect—verify you're using a 7×7-inch pan and a 6-quart or larger Instant Pot.
7
Cook under pressure
- Press the "Pressure Cook" or "Manual" button and set the cooking time to 25 minutes at high pressure.
- The Instant Pot will take 5–7 minutes to come to pressure before cooking begins.
- Once cooking starts, do not open the lid.
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Ready when: Timer reaches zero and Instant Pot beeps
Tip: The high-pressure environment ensures the bars cook evenly and stay moist. Do not use the quick release valve immediately.
8
Natural release and cool
- When the timer beeps, turn off the Instant Pot.
- Allow the pressure to release naturally for 10 minutes (you'll hear the valve hiss gently as pressure decreases).
- After 10 minutes, if the valve has stopped hissing, you can carefully open the lid.
- Using the foil sling handles, lift the pan straight up and out of the Instant Pot.
- Place the pan on a wire rack and let it cool completely at room temperature, about 15 minutes.
- The bars will continue to set as they cool.
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Ready when: Bars are cool to the touch and feel slightly firm when pressed gently
Tip: Rushing the cooling step can result in overly soft, difficult-to-cut bars. A cooled bar should spring back slowly when lightly pressed.
9
Make butterscotch miso glaze
- While the bars cool, prepare the glaze.
- In a small saucepan over medium heat, combine the butter (3 tbsp / 43 g) and packed brown sugar (¼ cup / 50 g).
- Stir constantly until the butter melts and the mixture bubbles gently, about 3 minutes.
- Remove from heat and let cool for 1 minute.
- Whisk in the white miso paste (1.5 tbsp / 27 g) until smooth, then whisk in the heavy cream (2 tbsp / 30 ml).
- The glaze should be glossy and pourable, with a slight sheen.
- If it's too thick, whisk in a few drops of cream.
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Ready when: Glaze is smooth, glossy, and pourable; no miso lumps remain
Tip: Whisking the miso into the warm (not hot) butterscotch ensures it dissolves smoothly without lumps.
10
Apply glaze and finish
- Once the bars are completely cool, remove and discard the foil.
- Drizzle or spread the warm butterscotch-miso glaze evenly across the top of the bars.
- Sprinkle lightly with fleur de sel or fine sea salt to taste (about ⅛ tsp total, or to your preference).
- The salt enhances both the butterscotch and miso flavors.
- Let the glaze set at room temperature for 10 minutes.
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Ready when: Glaze has set and no longer looks wet or glossy
Tip: Sprinkle salt sparingly—the umami from miso means a little goes a long way. Add less rather than more.
11
Cut and serve
- Using a sharp knife dipped in warm water and wiped clean between cuts, cut the bars into 12 squares (3 columns × 4 rows).
- Use the parchment overhang to lift the entire slab out onto a cutting board if desired, then cut.
- Serve at room temperature or slightly chilled.
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Ready when: Bars are cut into 12 clean squares with minimal crumbling
Tip: Dipping the knife in warm water prevents the glaze from sticking and ensures clean cuts. Wipe the knife between each cut for neat edges.

Good to know

Tips

The white miso paste is crucial—do not substitute dark, red, or hatcho miso, which are too intensely salty and bitter for this application. White miso is mild, slightly sweet, and umami-rich. Look for it in the international or Asian section of most supermarkets, or online.
The Instant Pot method yields remarkably moist, fudgy bars because the water bath regulates temperature precisely and steam keeps them from drying out. This gives them a texture between brownies and blondies.
If you don't have an Instant Pot, you can bake these in a preheated 325°F (163°C) oven in the same 7×7-inch pan for 30–35 minutes. They'll be slightly drier but still delicious.
The salt on top is optional but highly recommended—it's a professional touch that amplifies both the butterscotch and miso, making the flavor profile more sophisticated and less one-dimensionally sweet.

Make ahead

These bars can be made up to 2 days ahead. Store them in an airtight container at room temperature (they stay fresher longer than traditional oven-baked brownies due to the moist cooking method). They can also be frozen, unglazed, for up to 1 month; thaw at room temperature and add the glaze fresh before serving.

Storage & reheating

Room temperature (airtight container): up to 2 days. Refrigerator: up to 4 days (bars firm up slightly when chilled). Freezer: up to 1 month (unglazed, in an airtight container). Reheat frozen bars at room temperature for 30 minutes, then add fresh glaze.

Substitutions

white miso paste (shiro miso) → ⅛ tsp soy sauce mixed into the creamed butter before adding the egg. Soy sauce provides umami depth but is more intensely salty than miso. Start with ⅛ tsp and taste the batter before adding more. The bars will lack miso's subtle sweetness but will still have savory notes.
butterscotch chips → ¾ cup (130 g) chopped salted caramel candies or ¾ cup dark brown sugar mixed with 2 tbsp molasses. Caramel candies melt slightly into the bars. Molasses mixture deepens the brown sugar flavor, making the bars darker and richer but less distinctly butterscotch.
heavy cream → 2 tbsp whole milk or crème fraîche. Milk creates a thinner glaze and less richness; crème fraîche adds tanginess that complements the miso.
packed light brown sugar → ¾ cup (150 g) packed brown sugar + ¼ cup (50 g) white granulated sugar. This swap reduces molasses, resulting in lighter-colored, less chewy bars with a cakier crumb.