Slow Cooker Coconut Lime Oat Breakfast Porridge

Name: Slow Cooker Coconut Lime Oat Breakfast Porridge
Prep time: 10 min
Total time: 10 min
Yield: 4 servings
Cuisine: Thai-Inspired
Ingredients: 2 cups (180 g) old-fashioned rolled oats (not instant); 1½ cans (13.5 oz each) (810 ml) full-fat coconut milk (canned), not shaken (use the thick cream layer); 1½ cups (360 ml) water; 1 whole (1) lime, zested (about 1 tablespoon zest); 2 tablespoons (30 ml) lime juice (fresh); 1 teaspoon (5 ml) vanilla extract; ¼ teaspoon (1½ g) fine sea salt; 2 tablespoons (30 ml) honey or maple syrup; ¼ teaspoon (½ g) ground cardamom (optional); 1½ medium (about 12 oz) (340 g) fresh mango, peeled, pitted, diced into ½-inch cubes; ½ cup (45 g) unsweetened coconut flakes, toasted in a dry pan until golden; 1 whole (1) lime wedges (for serving) (optional)

From the MyKitchenBank Kitchen

A creamy, tropical-inspired porridge made in the slow cooker overnight. Rolled oats simmer gently in coconut milk with a hint of lime zest and vanilla, creating a silky base. In the morning, top with fresh mango, toasted coconut flakes, and a squeeze of lime juice for brightness. Perfect for meal prep—make it Sunday night and enjoy through the week.

Prep: 10 min
Cook: —
Wait: 8 hr
Total: 8 hr 10 min
Makes: 4 servings (about 1.5 cups porridge per bowl)

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Steps

Before you start

Have all ingredients measured and ready before bedtime so you can assemble the slow cooker quickly
Choose a 4-quart (3.8 L) oval or round slow cooker—don't use smaller, or oats will overcook and turn mushy
Prepare toppings (mango diced, coconut flakes toasted) the night before if possible for quick assembly in the morning

1
Toast coconut flakes
- Place coconut flakes in a dry skillet over medium heat.
- Toast, stirring constantly, for 2–3 minutes until light golden and fragrant.
- Transfer to a small bowl and let cool.
- This step can be done earlier in the day or the night before.
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Ready when: Coconut is light golden and fragrant, not dark brown
Tip: Watch closely—coconut flakes burn quickly. Stir constantly and remove when they're just starting to color.
2
Assemble slow cooker base
- Pour the full-fat coconut milk into the slow cooker.
- Do not shake the can first—you want the thick, creamy layer to incorporate naturally.
- Add the 1.5 cups water, lime zest, vanilla extract, salt, honey, and cardamom (if using).
- Stir well to combine.
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Ready when: All ingredients are stirred together with no lumps visible
Tip: Resist shaking the canned coconut milk before opening; the cream layer makes the porridge richer.
3
Add oats and set slow cooker
- Add the 2 cups rolled oats to the coconut milk mixture and stir thoroughly until all oats are submerged.
- Set the slow cooker to LOW heat, cover with the lid, and let cook for 8 hours overnight (or up to 10 hours if you want a thicker, more custard-like texture).
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Ready when: Oats are completely tender and the porridge has thickened significantly; it should be spoonable but creamy, not stiff
Tip: Resist the urge to peek under the lid during cooking—every time you lift it, heat escapes and you add 15–20 minutes to the cooking time.
4
Stir and adjust consistency
- In the morning, stir the porridge well with a spoon.
- It will be quite thick when warm from the slow cooker.
- If it's too thick, stir in a splash of warm water or milk (1–2 tablespoons at a time) until you reach your desired consistency.
- The porridge will thicken a bit more as it cools slightly, so don't over-thin it.
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Ready when: Porridge is smooth and pourable, with no lumps; it coats the back of a spoon
Tip: Add thinning liquid slowly—it's easier to thin than to thicken, and the porridge continues to absorb moisture as it sits.
5
Add lime juice and final taste
- Stir in the 2 tablespoons of fresh lime juice.
- Taste the porridge and add a pinch more salt or a drizzle of honey if needed to balance the tropical flavors.
- The lime juice should brighten the creamy coconut taste without making it overly tart.
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Ready when: Lime juice is fully stirred in and the flavor is balanced—sweet, creamy, and subtly tart
Tip: Add lime juice just before serving; if added the night before and left in the slow cooker, it can become slightly bitter.
6
Serve with toppings
- Divide the porridge among four bowls (about 1.5 cups per bowl).
- Top each serving with a generous handful of fresh diced mango, a sprinkle of toasted coconut flakes, and a small squeeze of fresh lime juice from a wedge if desired.
- Serve warm.
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Ready when: Bowls are filled and garnished; toppings are visible and appealing
Tip: Add toppings just before eating so the mango stays fresh and the toasted coconut doesn't soften.

Good to know

Tips

For overnight convenience, assemble the entire slow cooker base (everything except oats) in a bowl the night before. Store in the fridge, then pour into the slow cooker in the morning, add oats, and turn it on—perfect for busy mornings.
If your slow cooker runs hot, check the porridge after 7 hours. Different models vary, so you may need to pull it off heat earlier to prevent overcooking and separation.
Toast a double batch of coconut flakes on Sunday if you're meal-prepping for the whole week. Store in a dry place and add fresh to each reheated bowl.
For a creamier porridge, use the very thick coconut cream that settles at the top of a full-fat can. Scoop it out first, then use the thin liquid below to reach 1.5 cans total.

Make ahead

Prepare the slow cooker base the night before and refrigerate the insert (if removable) for up to 8 hours. In the morning, place the insert in the slow cooker and proceed with step 3. Toast coconut flakes up to 3 days ahead and store in an airtight container. Dice mango up to 6 hours ahead, cover with plastic wrap, and refrigerate.

Storage & reheating

Refrigerate leftover porridge in an airtight container for up to 4 days. Reheat in the microwave in 30-second intervals, stirring between each, or on the stovetop over medium-low heat with a splash of milk or water to restore creaminess. Freeze portions in airtight containers for up to 2 months; thaw overnight in the fridge and reheat gently. Toppings (mango and coconut) are best added fresh each time.

Substitutions

old-fashioned rolled oats (not instant) → Steel-cut oats (increase slow cooker time to 9–10 hours for tenderness). Steel-cut oats take longer to cook but result in a nuttier flavor and slightly chunkier texture.
full-fat coconut milk (canned) → Oat milk or almond milk (reduce water to 1 cup for similar consistency). These plant milks are thinner than coconut milk, so reduce water to keep the porridge creamy. The tropical flavor will be less pronounced.
fresh mango → Fresh pineapple, papaya, or canned mango (drained well). Any tropical fruit works; use about 1.5 cups diced. Canned fruit should be drained to avoid watering down the porridge.
honey or maple syrup → Agave syrup, brown sugar, or omit for a less sweet version. Reduce sugar by half if you prefer a more savory porridge; the natural sweetness of coconut milk and mango is substantial.