Add the onions and jalapeños and sautée for 3 minutes or until they start to get soft. Add the tomatoes, stir and cook until they start to get soft.
Add the mushrooms, salt, pepper, garlic powder and mix well to integrate all ingredients.
Cover and cook over medium heat for 10 minutes or until mushrooms are soft.
These Champiñones go perfect with a side of refried beans, Mexican rice, served as tacos, with chicken. Either way you choose to serve them, they will be a hit!