INGREDIENTS
**Muffin Batter.
1/2 cup
yogurt
4 tbsp
unsalted butter melted
3/4 cup
granulated sugar
1/2 tsp
vanilla extract
1
large egg
1 cup
+ 2 tablespoon all-purpose flour
1 tsp
baking powder
1/4 tsp
salt
**Streusel Topping.
3 tbsp
unsalted butter cut into cubes
1/2 cup
all-purpose flour
1/4 cup
packed brown sugar
salt