In shallow bowl, combine yogurt, eggs, and vanilla with a spoon; mix well. In large nonstick skillet, melt 1 Tbsp. butter over medium-high heat. Dip bread into yogurt batter and place in heated skillet. Repeat until skillet is filled with a single layer of bread slices. Cook until golden, 2 to 3 minutes, then flip and cook an additional 2 to 3 minutes. Remove to platter and keep warm. Melt another tablespoon of butter in the skillet, and repeat until all slices are cooked. Sprinkle slices with sugar and serve warm. Makes 6 servings.
*You may substitute honey, if desired.