Banana Muffin Recipe for Jumbo Muffins

2 1/4 cups all-purpose flour
1 tablespoon baking powder
1/2 teaspoon baking soda
1/2 teaspoon salt
2 1/4 cups ripe mashed banana
1/2 cup granulated sugar
1/2 cup sour cream (not low fat)
1/4 cup vegetable oil
3 large egg yolks
1 teaspoon vanilla extract
1 cup pecan or walnut pieces

Preheat the oven to 400 degrees.
Mix the flour, baking powder, baking soda, and salt together in a large bowl.
In another bowl, mix the mashed banana, sugar, sour cream, vegetable oil, egg yolks, and vanilla together.
Add wet ingredients to the dry and stir just until the ingredients are mixed well. Fold in the nuts.
Fill the well-greased tins nearly full. Use all the batter for six jumbo muffins. Sprinkle on the optional streusel topping.
Bake for 8 minutes at 400 degrees. Reduce the temperature to 350 degrees and bake for another 12 to 15 minutes or until done. Let sit for five minutes and remove the muffins from the pan to a rack to cool.

Streusel Topping
1/3 cup walnut or pecan pieces
1/3 cup brown sugar
2 tablespoons all-purpose flour
1/2 teaspoon cinnamon
2 tablespoons butter, melted

To make the streusel topping, combine all the ingredients and stir until well combined and crumbly.
Sprinkle over the muffins before baking.