Orange-Blueberry Bran Muffins

Step 1
Preheat the oven to 375 degrees F (190 degrees C). Grease a 12-cup muffin tin or line with paper liners.

Step 2
Combine wheat bran and oat bran in a large bowl. Stir in sour cream and milk; let stand for 10 minutes.

Step 3
Meanwhile, combine brown sugar, both flours, protein powder, baking powder, baking soda, and salt in a separate bowl. Gently stir blueberries into the mixture until they are coated.

Step 4
Stir olive oil, egg, orange juice and zest, and vanilla into the bran mixture. Add flour mixture and stir until just blended. Drop batter into the prepared muffin cups.

Step 5
Bake in the preheated oven until a toothpick inserted into the center comes out clean, 15 to 20 minutes. Cool in the muffin tin for 5 minutes. Remove muffins to a wire rack and let cool completely, about 25 more minutes.