Banana Muffins with Streusel Topping

Ingredients

• 1-1/2 cup all-purpose flour
• 3/4 cup sugar
• 1 tsp baking powder
• 1/2 tsp baking soda
• 1/4 tsp salt
• 1/2 cup evaporated milk
• 1/4 cup unsalted butter, melted
• 1 tsp vanilla extract
• 1 whole egg, room temperature
• 1 cup mashed banana
• 1/4 cup brown sugar
• 1 tbsp all-purpose flour
• 1/2 tsp cinnamon powder
• 1 tbsp cold butter
• 1/3 cup chopped walnuts or pecans