Easy Mini Quiche 12 slices bread 1 onion (grated) 1/2 cup swiss cheese (shredded) 1 cup milk 4 eggs 1 tsp dry mustard 1 pinch black pepper Preheat 375. Lightly grease 12 muffin tins. Cut bread into circles. Place circles in bottom of muffin tins. Distribute the onion and shredded cheese evenly between the muffin tins. In a medium bowl, combine milk, eggs, mustard and pepper. Divide between the muffin tins. Bake in preheated oven for 20 min, or until toothpick comes out clean.