Ingredients
Method
- Preheat oven to 375F
- Line a 12-cup muffin pan with muffin liners
Crumble Topping
- Combine flour, brown sugar, granulated sugar, and cinnamon in a small bowl. Make sure there are no lumps.
- Stir in melted butter until the mixture forms crumbles resembling damp sand.
Muffins
- In a bowl, whisk together flour, pumpkin pie spice, cinnamon, baking powder, baking soda, and salt until well combined.
- In a large bowl, whisk together oil, brown sugar, white sugar, eggs, vanilla, sour cream, and pumpkin puree until smooth.
- Gradually add the dry ingredients to the wet ingredients, whisking until no lumps remain.
- Spoon the batter evenly into the muffin pan, filling each cavity about 3/4 full.
- Sprinkle or crumble the streusel topping over each muffin, ensuring it covers evenly and generously.
- Bake for approximately 25 minutes (check around 22 minutes), or until a toothpick inserted into the center comes out clean.
- Allow the muffins to cool in the pan for at least 10 minutes before removing and placing on a wire cooling rack.