Blueberry Buttermilk Clafoutis

Ingredients (11)

• ✓ 1 teaspoon butter
• + 1 (10 ounce) package frozen blueberries add to pantry
• + 9 tablespoons all-purpose flour add to pantry
• + 1 pinch baking powder add to pantry
• + 1 pinch salt add to pantry
• ✓ 1 cup buttermilk
• + 3 eggs add to pantry
• + 6 tablespoons white sugar add to pantry
• + 1 teaspoon grated orange zest add to pantry
• + 1 teaspoon vanilla extract add to pantry
• + 1 tablespoon brown sugar, or more to taste add to pantry