Baked Eggs in Ham Cups without sprinkles

3/4 lb cremini mushrooms or 3/4 lb button mushroom , finely chopped 1/4 cup finely chopped shallots or 1/4 cup onion 2 tablespoons unsalted butter 1/2[...]

1 teaspoon unsalted butter , for the tins 4 ham slices (the largest you can find at the deli) 4 teaspoons pesto sauce 4 large eggs 8 pieces mozzarella cheese[...]