Easy Croque Monsieur Recipe

Ingredients

• 4 tablespoons butter or margarine, softened
• 6 slices white bread
• 1 tablespoon Dijon mustard
• 12 slices thinly sliced deli ham
• 2 tablespoons mayonnaise
• 6 slices Swiss cheese
• 4 tablespoons all-purpose flour
• 0.5 teaspoon baking powder
• 0.25 teaspoon salt
• 2 eggs
• 0.25 cup water
• 1 tablespoon vegetable oil