Heat olive oil in a large skillet. Add the onions and sauté for 5 minutes.
Add spices and cook for another minute, stirring continuously.
Add the peppers and mushrooms and continue to sauté for another 5 minutes.
Add the remainder of the ingredients and stir well. Bring to a boil.
Lower the heat, cover, and simmer for 20 minutes, stirring occasionally.
Serve in a bowl with chips or use for a burrito filling. Sprinkle with cheese (regular or non-dairy), if desired.
Store leftover casserole in an airtight container in the fridge for up to 5 days.
Equipment
Large skillet with lid
Notes
I like this casserole chunky so I chop the veggies into good sized pieces. But if you are using it as a burrito filling, I would chop the peppers, onions, and mushrooms into very small pieces.
If you are looking for more spice, add some cayenne pepper or hot sauce.
Allow the casserole to rest for a few minutes after cooking. This helps the flavors come together.