Cake Mix Blueberry Muffins w/ crumb topping

Muffin batter:
1 box of yellow cake mix
1 pint of blueberries

Crumb topping:
1 cups flour
1 cups packed light brown sugar
½ teaspoons coarse salt
½ TB ground cinnamon
1 stick unsalted butter, melted & cooled

Preheat oven to 350 degrees. Grease up jumbo muffin trays (mine got 12 jumbo).
In a bowl mix all the ingredients for the crumb topping, set aside.

Mix up the cake batter according to box directions. Fold in the blueberries carefully.
Fill up the muffin cups about ¾ full, sprinkle on the crumb topping.

Bake for about 30-40 minutes? Can’t remember but check them at the 30 minute mark.

I got 12 oversized muffins. I would imagine about 24 regular size?