BLESS THIS MESS
Preheat the oven to 375º F and prepare a muffin tin with liners.
Cream together the sugars and butter with a hand mixer (or stand mixer or with spoon).
Cream in the eggs, vanilla, and sour cream. Add the flour, baking powder, baking soda, and salt and stir well.
Fold in the blueberries, then transfer to the muffin tin, filling about ¾ of the way up.
Make the topping by stirring together the sugar, flour, and cinnamon, and then cut in the butter.
Sprinkle the topping over the muffin batter in the tin and bake for 20-25 minutes, using a toothpick to check when they’re done. Allow to cool before enjoying!