Banana Nutella Swirl Muffins

I made these muffins a few weeks ago when Gray came home with buy one get one free Nutella. Mmm...Nutella.  I made these yummy muffins which are slightly adapted from The Novice Chef.

2 cups flour
1 tsp baking soda
1 tsp baking powder
1/2 tsp salt
4 medium or 3 large over-ripe bananas (mashed)
1/2 cup granulated sugar
1/2 cup packed brown sugar
1 large egg
1/4 cup vegetable oil
2 tsp vanilla extract
Nutella

Heat oven to 350.  Line muffin tin with liners and grease the liners so the muffins won't stick so badly.  In a medium size mixing bowl combine flour, baking soda, baking powder and salt.  In a large mixing bowl mis together the mashed bananas and sugars.  Beat in the eggs, vegetable oils and vanilla extract. Fold in the flour mixture until it is combined and there are no lumps.  Fill the muffin tins 3/4 of the way full.  Add a teaspoon of Nutella to each muffin, swirl in with a toothpick.  Bake muffins for 15 to 17 minutes or until they are cooked through.  Cool in muffin tin for 5 minutes before removing.