Step 1

Preheat the oven to 350°F (180°C).

Step 2

Cut the head of cauliflower in half, remove the stem, and chop into small pieces. Set aside.

Step 3

Heat the oil in a large cast-iron skillet over medium heat. Add the garlic and onion and cook until fragrant, about 2 minutes.

Step 4

Add the corn, carrots, black beans, and 2 cups (600 g) of cauliflower and cook, stirring often, for another 3 minutes, until the corn starts to brown around the edges.

Step 5

Add the flour, chili powder, and salt and stir until the vegetables are evenly coated.

Step 6

Add the milk and diced tomatoes and cook, stirring constantly, until thickened, about 3 minutes.

Step 7

Add the mozzarella cheese and stir until melted.

Step 8

Turn off the heat and arrange the tater tots on top of the vegetable mixture.

Step 9

Transfer to the oven and bake until browned and bubbling, about 30 minutes.

Step 10

Garnish the casserole with tomato, red onion, jalapeño, and cilantro, if using.

Step 11

Enjoy!