3. Step
Meanwhile, heat oil in a large ovenproof skillet over medium heat. Add onion; cook, stirring, until starting to soften, about 3 minutes. Add garlic; cook, stirring, until fragrant, 30 seconds. Add corn, poblano, tomato, chili powder, cumin and the remaining 1/4 teaspoon salt; cook, stirring, until the vegetables have softened, about 5 minutes. Stir in beans, the cooked quinoa and 3/4 cup cheese. Spread into an even layer and sprinkle with the remaining 1/2 cup cheese.