for the streusel mix the flour, brown sugar, salt, and cinnamon together

cut the butter in with two butter knives, or pulse it together in the food processor, mix until crumbs form

put in the fridge to keep cool

preheat oven to 350˚

butter a 10 inch cast iron skillet OR a 1 1/2 quart baking dish

beat the butter and sugar until fluffy

beat in the vanilla

add the eggs one at a time, mixing well after each addition

stir together the flour, baking powder, and salt

slowly mix into the the butter mixture

stir the fresh blueberries in by hand being careful not to crush them

sprinkle with the streusel

bake at 350˚ for 35-40 minutes, or until the cake pops bake when you poke it