Charlie's Blueberry Muffins

Charlie made these for Christmas 2010.
The red and green sprinkles weren't the most attractive toppings.
But everyone remembered them.

Makes 16 Medium Muffins

1/4 c unsalted butter, melted
1/4 c Canola oil
1 1/2 sugar
2 large eggs
1 T vanilla
2 1/2 c flour, divided
1 1/2 tsp baking powder
1/4 tsp baking soda
1/4 tsp salt
1/2 c milk
1/4 c sour cream
1 1/2 cups frozen blueberries

Whisk butter, oil, and 1 1/2 cups sugar.  Whisk in eggs and vanilla. Whisk 2 cups flour with powder, soda, and salt.  Gently fold into egg mixture.  Mix sour cream and milk.  Fold into batter.  Mix 1/2 c flour with 1 1/2 cups blueberries.  Gently stir into batter.  Scoop batter into 16 regular sized muffin tins.  Sprinkle tops with extra blueberries and sugar.  Bake10 minutes at 425F.  Reduce oven   to 350F bake 14 to 16 minutes longer.  Test centers with a toothpick.