Oat Flour Blueberry Muffins
Tender, moist muffins made with oat flour and fresh or frozen blueberries, bound together with eggs and yogurt for a fluffy crumb. These are naturally wholesome, not overly sweet, and perfect for breakfast or a snack.
Steps
Before you start
- Preheat oven to 375°F (190°C) and line a 12-cup muffin tin with paper liners or grease the cups
- Have all ingredients at room temperature for even mixing
- If using frozen blueberries, do not thaw—add them directly from the freezer to prevent excess moisture
Whisk dry ingredients
- In a medium bowl, whisk together oat flour, baking powder, baking soda, salt, and cinnamon until evenly combined.
- Set aside.
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Ready when: No lumps visible in the mixture
Tip: Whisking distributes the leavening agents evenly so muffins rise uniformly
Combine wet ingredients
- In a large bowl, whisk together eggs, Greek yogurt, honey, vegetable oil, and vanilla extract until smooth and well blended.
- The mixture should look homogeneous with no streaks of yogurt remaining.
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Ready when: Mixture is smooth and uniform in color
Tip: Whisking the wet ingredients breaks down the yogurt so it integrates smoothly and won't create dense pockets in the batter
Fold in dry mixture
- Add the dry ingredients to the wet ingredients and fold together with a rubber spatula using about 12–15 strokes.
- Stop as soon as you see no white streaks of flour—the batter will be slightly lumpy, and that is correct.
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Ready when: No visible streaks of dry flour remain
Tip: Overmixing develops gluten and makes muffins tough; a few lumps result in a tender, more delicate crumb
Add blueberries
- Gently fold the blueberries into the batter using just 2–3 strokes of the spatula.
- If using frozen blueberries, toss them with 1 tablespoon of the oat flour first (from the measured amount) to help them stay distributed and prevent them from all sinking to the bottom.
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Ready when: Blueberries are evenly scattered throughout
Tip: A flour coating on frozen blueberries prevents them from settling to the bottom and sinking into dense clumps
Fill muffin cups
- Using an ice cream scoop or ¼-cup measure, divide the batter evenly among the 12 muffin cups, filling each about two-thirds full.
- Gently smooth the tops with the back of the scoop.
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Ready when: All cups filled to roughly the same level
Tip: Even portioning ensures all muffins bake at the same rate and have similar texture
Bake muffinsOven 375°F / 190°C
- Bake in a preheated 375°F (190°C) oven for 20–22 minutes, until the tops are light golden brown and a toothpick inserted into the center of a muffin comes out with just a few moist crumbs (not wet batter).
- The muffins should spring back when gently pressed on top.
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Ready when: Golden tops; toothpick shows moist crumbs; muffins bounce back when pressed
Tip: Oat flour muffins can appear underbaked in the center even when fully done—watch for the spring-back test more than visual cues
Cool in pan
- Remove the muffin tin from the oven and let the muffins cool in the pan for 10 minutes.
- This allows them to firm up enough to remove easily without tearing.
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Ready when: Muffins have pulled away slightly from the sides of the cups
Tip: Cooling briefly in the pan prevents the muffins from collapsing or sticking; don't skip this step
Unmold and serve
- Run a thin knife around the edge of each muffin cup and gently tip or pop the muffins out onto a wire rack or plate.
- They can be served warm or at room temperature.
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Ready when: Muffins release cleanly and sit upright
Tip: A thin knife or small offset spatula works better than fingers to release muffins without damaging them
Good to know
Tips
- Oat flour is less heavy than all-purpose flour, so these muffins are naturally lighter in texture. Do not add extra flour or they will become dense.
- For the most moist muffin, use full-fat Greek yogurt; nonfat yogurt works but produces a slightly drier result.
- Frozen blueberries work beautifully and often taste as good as fresh—they distribute evenly and release less juice, keeping the crumb tender.
- If your muffins peak dramatically or develop a large dome, your oven temperature may be too high; use an oven thermometer to verify.
Make ahead
Batter can be prepared and held in the refrigerator for up to 4 hours before baking. Baked muffins can be frozen for up to 2 months; thaw at room temperature or microwave individually for 30–45 seconds.
Storage & reheating
Store in an airtight container at room temperature for up to 2 days. Refrigerate for up to 5 days. Freeze in a freezer bag for up to 8 weeks. Reheat thawed or frozen muffins wrapped in foil in a 350°F (175°C) oven for 8–10 minutes, or microwave for 30–45 seconds.
Substitutions
- plain Greek yogurt (nonfat or full-fat) → sour cream or plain full-fat yogurt (traditional or Icelandic). Use the same amount. Sour cream adds a subtle tang; traditional yogurt will produce a slightly looser batter, so add 1 extra tablespoon of oat flour
- honey → maple syrup, agave syrup, or brown sugar. Use the same amount by weight or volume. The flavor will shift slightly, but moisture and sweetness remain consistent
- fresh or frozen blueberries → blackberries, raspberries, or diced strawberries. Use the same weight. Raspberries and blackberries are more delicate; add them at the very end to avoid breaking apart
- oat flour → a mix of rolled oats ground to flour consistency or spelt flour. Oats must be ground finely; spelt will produce a slightly denser muffin and may require an extra tablespoon of yogurt to account for higher protein
