basic banana muffins w/ crumb topping

Ingredients For basic banana muffins w/ crumb topping

• 1 c

  all-purpose flour
• 1/2 c

  whole wheat flour
• 1 tsp

  baking soda
• 1 tsp

  baking powder
• 1/2 tsp

  salt
• 3 lg

  ripe bananas, mashed
• 3/4 c

  sugar
• 1 lg

  egg, lightly beaten
• 1/3 c

  melted butter
• 1/3 c

  packed, light brown sugar
• 2 Tbsp

  flour
• 1/8 tsp

  cinnamon
• 1 Tbsp

  butter