Preheat oven to 400°, lightly grease twelve 2 1/2 inch muffin cups.
Combine flour, baking powder, salt, and cinnamon in medium bowl. Combine grated lemon rind and sugar in small bowl, set aside.
Beat bananas in bowl of stand mixer until mashed. Add eggs, brown sugar, melted butter, and vanilla. Beat until well blended.
Add dry ingredients, mix on lowest speed until just combined. Remove from mixer and fold in blueberries.
Spoon into prepared muffin cups, being careful to divide batter equally.
Sprinkle each muffin with generous amount of lemon sugar topping.
Bake in preheated oven for 20-22 minutes or until golden. Remove muffins from pan to wire rack. Serve hot or allow to cool completely before storing in airtight container.