Method

• Step

  MIX all the crumb topping ingredients together until they form coarse crumbs, then set aside.

• Step

  COMBINE the flour, brown sugar, baking powder, baking soda, cinnamon, and salt together in a large bowl.

• Step

  WHISK the sour cream, butter, egg, and vanilla together in a separate bowl until well combined.

• Step

  MIX the wet ingredients with the dry ingredients until thoroughly combined.

• Step

  SELECT Preheat on the air fryer, adjust to 350°F, then press Start/Pause.

• Step

  GREASE muffin cups with the cooking spray and pour the batter in until the cups are ¾ full.

• Step

  SPRINKLE the top of the muffins with the crumb topping.

• Step

  PLACE the muffin cups into the preheated air fryer. If all the muffin cups do not fit at once, you may need to work in batches.

• Step

  COOK the muffins at 350°F for 12 minutes.