Baked Eggs With Spinach without potatoes

10 ounces baby spinach leaves 1/4 cup onion , finely chopped 1 garlic clove , finely chopped 2 tablespoons unsalted butter 5 ounces mushrooms , thinly sliced[...]

1 small round loaf crusty bread, 2 ends removed, the rest cut into 4 thick slices (about 10 ounces) 3/4 lb asparagus , tough ends snapped off and discarded,[...]

6 slices bacon , applewood-smoked 1 (5 ounce) bag baby spinach 2 English muffins , split horizontally, well toasted 4 large eggs 4 tablespoons heavy whipping[...]