Cheesy Fiesta Rice

Name: Cheesy Fiesta Rice
Prep time: 10 min
Cook time: 10 min
Total time: 20 min
Cuisine: Mexican
Ingredients: 1 tbsp. extra-virgin olive oil, plus more if needed; 1 medium onion, chopped; 2 cloves garlic, minced; 1 tsp. dried oregano; 1/2 tsp. ground cumin; 1 c. large head cauliflower, grated, or 4 cups riced cauliflower; Kosher salt; Freshly ground black pepper; 1 tbsp. tomato paste; 2 c. shredded rotisserie chicken; 1 c. (15-oz.) can black beans, drained and rinsed; 1 c. corn kernels (fresh, canned, or thawed frozen); 1 c. chopped tomatoes; 2 jalapeños, thinly sliced; 1/4 c. freshly chopped cilantro; 1 c. shredded cheddar; 1 c. shredded Monterey jack; Lime wedges, for serving