Heat oven to 350°F/177℃.
Line a muffin tin with baking cups, or spray with baking spray. Set aside.
Whisk together flour, baking soda, and baking powder. Set aside.
With an electric mixer, beat butter and sugars until light and fluffy, 3-4 minutes.
Beat in eggs, one at a time, mixing thoroughly after each addition.
Stir in vanilla.
Stir in sour cream.
Mix in flour mixture.
Place 1½ Tablespoons batter in the bottom of each muffin cup.
Top with ½ Tablespoon streusel.
Add another 1½ Tablespoons batter to each muffin.
Top with ½ Tablespoon streusel.
Bake 20-25 minutes, until muffins are lightly browned and test done.