Copycat Panera Wild Blueberry Muffins~Jill

INGREDIENTS

for the topping:

1/3 cup

coarse (or raw sugar)

1/3 cup

all-purpose flour

4 tbsp

unsalted butter (cold and cut into four pieces)

for the muffins:

1 1/2 cups

all-purpose flour

3/4 cup

granulated white sugar

2 tsp

baking powder

1/2 tsp

salt

1/3 cup

vegetable oil

large egg

old-fashioned buttermilk (see directions for measurement)

2 tsp

vanilla extract

1 cup

frozen wild blueberries