Banana Muffins With Streusel Topping
["1/4 c. packed brown sugar", "1/4 c. chopped nuts", "1 tsp. ground cinnamon", "1 c. mashed bananas (2 to 3)", "1/2 c. vegetable oil", "1/3 c. milk", "1 tsp. vanilla", "1 egg", "2 c. flour", "1/2 c. sugar", "3 tsp. baking powder", "1 tsp. salt", "1/3 c. chopped nuts (optional)"]
["Heat oven to 400\u00b0.", "Grease bottoms of muffin cups.", "Mix brown sugar, 1/4 cup nuts and cinnamon; set aside.", "Beat bananas, oil, milk, vanilla and egg.", "Stir in remaining ingredients all at once, except the reserved mixture of brown sugar, nuts and cinnamon. Stir until moistened and divide evenly into 12 to 15 muffin cups. Sprinkle top with reserved mixture.", "Bake about 20 minutes. Immediately remove from muffin cups.", "\"Enjoy.\""]
["brown sugar", "nuts", "ground cinnamon", "bananas", "vegetable oil", "milk", "vanilla", "egg", "flour", "sugar", "baking powder", "salt", "nuts"]