Shepherd's Pot Pie

What happens when you make a pot pie, but instead of a top crust, you use mashed potatoes? It's exactly as delicious (and totally crazy) as it sounds. I didn't write down a recipe, but my filling was leeks, celery, carrots, and peas, with TVP, nutritional yeast, vegetable broth, tamari soy sauce, and some soymilk, seasoned with a few shakes of cayenne and some dried sage. I think any meat sub would have worked, though.