Step 1

Preheat oven to 400°F.

Step 2

Combine water, quinoa and 1/4 teaspoon salt in a medium saucepan; bring to a boil over high heat. Reduce heat, cover and simmer until the water is absorbed, about 15 minutes. Remove from heat, fluff with a fork and partially cover.

Step 3

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.

Step 4

Bake until the casserole is hot and the cheese has melted, about 15 minutes. Serve sprinkled with cilantro and with salsa (or pico de gallo) on the side, if desired.