Stuffed Mushroom 'Pizza'

Ingredients for a 1 person serving
-1 large portabella mushrooms, separate stems
-protein (cooked meat, poultry, fish, beans, etc.)
-tomato sauce, or fresh chopped garlic + olive oil for base
-chopped carrots, onion, chives, basil, and stems
-1/2 cup spinach/ kale/ chard
-avocado slices

-1 medium sized bowl to mix in chopped vegetables and stems
-1 large glass piece for cookware

-Preheat oven to 375 degrees. 
-Place mushroom cap(s) on glassware, rounded sides down. Bake until tender, about 16-18 minutes. Leave oven on.
-Top mushrooms like you would a pizza, then put back in oven for another 5-10 minutes.