Preheat oven to 400 f. and line a baking tray with parchment paper.
Lightly spray the mushrooms with avocado or olive oil, season with sea salt and pepper, then place them on the prepared baking tray.
Bake for about 10 minutes.
Meanwhile, prepare the stuffing.
Heat a large skillet over medium heat.
Once hot, add 1 Tbsp oil, onion, garlic and bell pepper.
Sauté for 3-5 minutes stirring occasionally.
Add in black beans, sweet corn, quinoa, ground cumin, chili powder, and ground cumin.
Sauté for an additional 3-5 minutes until veggies are beginning to soften and golden brown.
Season with sea salt and pepper.
Divide the stuffing equally between the mushrooms.
Bake for about 5 minutes or until mushrooms and toppings are hot and slightly browned.
Garnish with fresh chopped cilantro and lime wedges.