Sweet and Simple Blueberry Muffins

Ingredients (21)

• For the Muffins:
• 2 cups blueberries (fresh)
• 2 teaspoons lemon juice
• 1/2 teaspoon lemon zest
• 1 cup sugar
• 2 cups all-purpose flour (unbleached)
• 1 tablespoon baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 6 tablespoons butter (unsalted, melted)
• 2 tablespoons vegetable oil
• 1/4 cup sour cream
• 3/4 cup buttermilk
• 1 teaspoon vanilla extract
• 2 eggs (1 if they are extra large)
• For the Topping:
• ⅓ cup brown sugar
• 1/4 cup flour
• 1/2 teaspoon vanilla extract
• 2 tablespoons butter (melted)
• 1/2 teaspoon cinnamon