01 -
Combine the dry ingredients. Whip up the butter, sugar, and vanilla until creamy. Mix in the egg and oil. Gradually add the flour mix and buttermilk, switching between the two.
02 -
Lightly coat the blueberries in some flour, then gently fold them into the batter. Let it sit for 30 minutes.
03 -
Combine the dry topping ingredients, then drizzle in melted butter and vanilla to form a crumbly mixture.
04 -
Preheat the oven to 400°F. Drop scoops of batter onto parchment-lined baking sheets and sprinkle some streusel on top.
05 -
Bake for about 11 to 13 minutes, turning the tray halfway through the baking.