Blueberry Banana Coffee Cake

Ingredients

• ½ cup unsalted butter, room temperature
• 1 Tbs lemon juice
• 1 cup sugar
• 1 egg
• 2 mashed bananas
• 1 tsp. vanilla
• 2 cups flour (set aside ¼ cup of this to toss with the blueberries)
• 2 tsp. baking powder
• 1 tsp. salt
• 1 cup fresh blueberries
• ½ cup milk or buttermilk
• Topping
• ¼ cup butter
• ½ cup brown sugar
• ½ flour
• ¼ cup nuts, pecans or walnuts