In a small bowl, add the flour, brown sugar, cinnamon, and melted butter and mix until all the dry ingredients are coated in the butter.
1 cup flour, ¼ cup light brown sugar, 2 teaspoons cinnamon, 5 tablespoons butter
Sprinkle the topping evenly over the muffin batter in the muffin tin.
Bake for 18-20 minutes or until a toothpick inserted in the center comes out clean.
Remove from the oven and allow the muffins to cool in the pan for 5 minutes then transfer them to a wire cooling rack to cool completely.
Notes
Add chopped pecans or walnuts to the streusel topping.Swap the brown sugar for dark brown sugar or white sugar in the topping.How to Store Leftover MuffinsThe muffins will stay fresh in an airtight container for up to 3 days. You can store them at room temperature. You can also store them in the refrigerator for up to 5-7 days.You can freeze these muffins for up to 3 months. Place them in a freezer-safe container or in freezer bags, and freeze.Defrost the muffins at room temperature or in the microwave for a few seconds before serving!