Step 1

Preheat oven to 375 F.

Step 2

Grease a 12-cup muffin tin with nonstick baking spray, or line with muffin cups.

Step 3

Make the muffin batter: In a large bowl, whisk together the flour, baking powder, baking soda, cinnamon, and salt until combined. Set aside.

Step 4

In a separate large bowl, cream together the softened butter and granulated sugar until smooth and fluffy.

Step 5

Beat maple syrup, eggs, milk, sour cream, and vanilla extract into the butter mixture until smooth.

Step 6

Add flour mixture to the bowl of wet ingredients and beat until just combined.

Step 7

Spoon batter into the prepared muffin tin, and set aside.

Step 8

Make the crumb topping: In a medium bowl, whisk together the brown sugar, granulated sugar, cinnamon, and melted butter until smooth.

Step 9

Add flour and use a fork to mix the ingredients together until large crumbs form. (Do not overmix).

Step 10

Spoon the crumble over the batter in the muffin tin.

Step 11

Bake muffins for 18-20 minutes, until a toothpick inserted in the center comes out clean.

Step 12

Let muffins cool in the pan for a few minutes before transferring to a wire rack.

Step 13

Serve.