1 lb. 85/15 lean ground beef 1 medium-size yellow onion, chopped (about 1 1/2 cups) 1 (1-oz.) pkt. original taco seasoning (such as Old El Paso) 1/2 tsp. kosher salt 2 cups frozen corn, thawed 1 (15-oz.) can black beans, rinsed and drained 1 (5-oz.) can chopped mild green chiles, drained 8 oz. shredded Mexican cheese blend (about 2 cups), divided 1 (32-oz.) bag frozen potato tots 1/2 cup sour cream 2 Tbsp. hot sauce (such as Cholula) 2 Tbsp. fresh lime juice (from 1 lime) 1 ripe (6 oz.) avocado, chopped 1 small (5 oz.) tomato, chopped 1 jalapeño chile, thinly sliced Cilantro leaves, for garnish