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Heat the oil or butter in a wide skillet over medium-high heat. Add mushrooms and spread into one layer. Cook, without moving, until browned on one side, 3 to 5 minutes.
Stir the mushrooms around the pan, and then add the sliced onions, peppers, onion powder, garlic powder, cumin, oregano, smoked paprika, pepper and the salt. Cook the vegetables until the onions have softened and smell sweet, about 5 minutes. Add the kale or spinach and cook until bright green and wilted, another 2 to 3 minutes.
Make quesadillas or transfer the cooked vegetables to an airtight container and refrigerate up to 5 days.
Heat a heavy-bottomed skillet over medium heat. Lightly spray the pan or brush it with oil, and then place one tortilla down into the pan.
Spread a quarter of the cheese over the tortilla and then spoon a quarter of the cooked vegetable mixture onto one half. Carefully fold the tortilla in half, and then use a spatula to press the top down so that it stays folded. Cook until the underside is toasted, about 2 minutes.
Carefully flip the quesadilla and cook until the second side is toasted and the cheese is melted, 1 to 2 minutes. Transfer the quesadilla to a cutting board and cut in half. Repeat with remaining quesadillas.
Keep cooked quesadillas warm in a 200 degree F oven while you finish making the remaining quesadillas.