Apple Crumble Muffins

Ingredients:

1 cup whole wheat flour
3/4 cup white flour
3/4 cup rolled oats
2 teaspoons apple pie spice
1 teaspoon baking soda
1/2 teaspoon salt
1 egg
1 cup buttermilk (or 1 cup minus 2 tbsp milk PLUS 2 tbsp vinegar)
1/2 cup butter, melted
1 tsp pure vanilla extract
1 cup packed brown sugar
2 cups peeled, chopped apples

Crumb Topping:

1/2 cup packed brown sugar
1/3 cup all-purpose flour
¼ cup rolled oats
1 teaspoon ground cinnamon
3 tablespoons butter, softened

Directions:

1. Preheat the oven to 375 degrees F. Line 12 cup muffin cups with paper liners.
2. In a large bowl, whisk together flour, apple pie spice, baking soda, and salt. In a small bowl, whisk together the egg, buttermilk, 1/2 cup melted butter, vanilla and brown sugar. Stir until sugar has dissolved.
3. Pour butter mixture into the flour mixture and stir until just combined (don't overmix). Gently fold in apples. Use a large scoop to fill each muffin well, filling the cups to the top.
4. In a small bowl, stir together 1/2 cup of brown sugar, 1/3 cup flour, rolled oats, and cinnamon. Massage in 3 tablespoons of softened butter, mixing until well blended. Sprinkle over the tops of the muffins.
5. Bake in preheated oven for 25 minutes, or until the tops of the muffins spring back when lightly pressed.

This recipe is adapted from another one of my "go-to" websites: My Baking Addiction http://www.mybakingaddiction.com/apple-streusel-muffins-recipe/