Blueberry Yogurt Coffee Cake Muffins

Bahan-bahan (12 porsi)

• 1 stick (8 tablespoons) salted butter, at room temperature
• 1/2 cup granulated sugar
• 1 tablespoon lemon zest
• 1/2 cup plain Greek yogurt
• 1 tablespoon vanilla extract
• 3 eggs at room temperature
• 1 1/2 cups + 1 tablespoon white whole wheat flour
• 2 teaspoons baking powder
• 1/2 teaspoon salt
• 1 cup fresh or frozen blueberries
• 3 tablespoons blueberry jam
• 1/2 cup granulated sugar
• 2 teaspoon cinnamon
• 2 tablespoons butter, melted