In a large bowl, mix the brown and white sugar, eggs, melted butter, vanilla, sourdough cream, and milk.
1/2 cup brown sugar, 1/2 cup white sugar, 2 eggs, 1/2 cup melted butter, 1.5 tsp vanilla , 1/2 cup sour cream, 1/3 cup milk
Pour half of the dry ingredients to the wet ingredients and mix with a spatula. Add the rest of the dry ingredients and mix until just combined. Do not over mix. Add the chopped apples and mix until just combined. Fill the cupcake liners to the top with batter.
1/2 cup chopped apples
Streusel Topping
Whisk together the flour, sugar, cinnamon, and nutmeg. Pour in the melted butter and mix with a fork, using an upward motion, until small crumbles form. Sprinkle the top of each muffin with 1-2 tablespoons crumble topping.
2/3 cup flour, 1/3 cup brown sugar, 1 tsp cinnamon , 1/4 tsp nutmeg, 1/4 cup melted butter
Bake
Bake at 425 degrees F for five minutes. Leave the oven door closed and adjust temperature to 350 degrees F. Bake for an additional 15-16 minutes or until a toothpick comes out clean. Remove muffins from tin and cool on wire rack.
Icing (optional)
Whisk together confectioner's sugar, vanilla, and 3 tablespoons cream (or milk). Add additional cream by the tablespoonful until desired consistency forms. Drizzle over warm muffins.
1 cup confectioner's sugar, 3-5 tbsp heavy cream, 1 tsp vanilla extract
Notes
For less mess, use a large cookie scoop to scoop out the muffin batter.
Fresh, juicy apples are the best option for this recipe, I like to use Granny Smith or Pink Lady.
For tender muffins do not over-mix the batter.
Substitute cream for milk in the icing if desired. Almond and oat milk also work.