1/4 cup plain nonfat Greek yogurt
1 tsp. pure maple syrup
1/2 cup low-fat buttermilk, room temperature
1 1/2 tsp. vanilla extract
1 large egg
1/2 tbsp. unsalted butter, melted
1/4 tsp. salt
1/2 tsp. baking powder
1 tsp. baking soda
1 1/4 cups all-purpose or whole wheat pastry flour