Heat oven to 375 degrees F. Coat indents of one 12-cup muffin pan with nonstick cooking spray, see Note.
In medium-size bowl, combine flour and brown sugar. Cut in butter until mixture is crumbly. Stir in nuts and set aside.
In large bowl, whisk together flour, nuts, baking soda, pumpkin pie spice and salt.
In a medium-size bowl, whisk bananas, granulated sugar, milk, brown sugar and egg. Make a well in flour mixture; add banana mixture. Stir until ingredients are just moistened.
Spoon a rounded 1/4 cup of batter into each muffin cup. Evenly crumble topping over each. Bake at 375 degrees for 20 minutes or until a toothpick comes out clean. Cool in pan on rack for 5 minutes. Release muffins with a spatula and cool completely on a rack. Makes 12 muffins.