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Preheat oven to 425°F (218°C). Spray a 12-count muffin pan with nonstick spray or use muffin liners. Set aside.
For the topping: Mix all of the topping ingredients together. Set aside.
For the muffins: Whisk the flour, baking soda, baking powder, and salt together in a large bowl. Set aside.
Using a handheld or stand mixer fitted with a paddle or whisk attachment, beat the butter, granulated sugar, and brown sugar together on high speed until smooth and creamy, about 3 minutes.
On medium speed, add the eggs one at a time, beating well after each addition. Beat in the sour cream and vanilla extract on medium speed until combined.
With the mixer running on low speed, add the dry ingredients and milk into the wet ingredients and beat until combined. Batter is thick and creamy. Fold in the blueberries.
Spoon the batter into liners, filling them all the way to the top. Spoon brown sugar topping on each, gently pressing it down into the surface so it sticks.
Bake for 5 minutes at 425 then, keeping the muffins in the oven, reduce the oven temperature to 350°F (177°C). Bake for an additional 18–20 minutes or until a toothpick inserted in the center comes out clean.
Allow the muffins to cool for 5 minutes in the muffin pan, then transfer to a wire rack to continue cooling.