Step 1

Grease a 3-quart baking dish. In a large bowl whisk together milk, eggs, garlic, 1/2 teaspoon salt, and 1/4 teaspoon black pepper.

Step 2

Spread half the bread slices with mustard, then top with ham and half of the cheese. Spread remaining bread slices with butter then place buttered sides down on cheese. Cut each sandwich diagonally into four triangles. Arrange points up in prepared baking dish. Pour egg mixture over sandwiches. Sprinkle with remaining cheese. Cover; chill overnight.

Step 3

Preheat oven to 350°F. Uncover dish. Bake 35 minutes or until golden and egg mixture is set. Remove. Let cool 10 minutes. Sprinkle with powdered sugar.