Chile Relleno Casserole
Bottom: 1 can chiles
Next layer: all monterey jack cheese
Next layer: 2 cans chiles
Next layer: cheddar cheese
This reheats beautifully, but doesn't freeze well. I've cooked the night before, refrigerated, and then taken to work for breakfast.
You can also subsitute mushrooms/bacon/swiss for chiles/cheddar. Key is using Monterey jack cheese since it's not as oily.