Banana Blueberry Buttermilk Muffins

Ingredients

• 4 cups all-purpose flour
• 1/2 cup granulated sugar
• 2 tsp. baking powder
• 1 1/2 tsp. salt
• 1 tsp. baking soda
• 2 large eggs
• 2 cups fresh buttermilk
• 1/2 cup canola oil
• 3 ripe bananas (1 cup mashed)
• 3/4 cup blueberries - fresh or frozen
• 1 1/2 cup all-purpose flour
• 1/3 cup butter, softened
• 1/2 cup sugar
• 1/2 tsp. ground cinnamon
• 1 tsp. pure vanilla extract