Preheat and prep: Set your oven to 350°F (175°C). Line a 12-cup muffin tin with liners or lightly spray with nonstick spray. This helps keep the muffins lean and easy to release.

Make the oat flour: If you’re using rolled oats, blend them in a blender until they look like fine flour. You’ll need about 1 heaping cup of oats to yield 1 cup of flour.

Mix dry ingredients: In a large bowl, whisk 1 cup oat flour, 1/2 cup vanilla whey protein powder, 1 1/2 teaspoons baking powder, 1/4 teaspoon baking soda, and 1/4 teaspoon salt. This prevents clumping and helps even rise.

Whisk wet ingredients: In a separate bowl, combine 3/4 cup plain nonfat Greek yogurt, 1/2 cup unsweetened applesauce, 2 egg whites, 1 teaspoon vanilla extract, and 1/4–1/3 cup sweetener (adjust to taste). Stir until smooth.

Combine gently: Pour the wet mixture into the dry. Stir with a spatula until just combined. The batter will be thick—avoid overmixing so the muffins stay tender.

Add chocolate chips: Fold in 3 tablespoons mini chocolate chips, reserving a teaspoon to sprinkle on top. Mini chips ensure chocolate in every bite without adding many calories.

Fill the cups: Divide the batter evenly among the 12 muffin cups. They should be about 3/4 full. Sprinkle the remaining mini chips on top for a bakery-style look.

Bake: Bake for 12–15 minutes, or until the tops spring back lightly and a toothpick comes out mostly clean (a little melted chocolate is fine). Avoid overbaking—whey can dry out quickly.

Cool: Let the muffins rest in the pan for 5 minutes, then move to a wire rack. Cooling helps them set and prevents soggy bottoms.

Serve: Enjoy warm or at room temperature. For an extra treat, microwave a muffin for 10–12 seconds to re-melt the chips.