Breakfast for dinner can be as simple as throwing a frozen waffle in the toaster and serving it with some scrambled eggs. But is that really a worthy dinner? Instead, treat yourself to a breakfast hearty enough to assume the dinner mantle. Enter these spinach and feta muffins, packed with meaty cremini mushrooms and flecked with fresh dill. These muffins are brimming with Mediterranean flavors that satisfy morning, noon, and night.