Mexican Meat Patties with Fresh Corn Salsa

Name: Mexican Meat Patties with Fresh Corn Salsa
Ingredients: 1/2 lb. ground beef; 1/2 lb. ground pork; 1/2 tsp. garlic powder; 1/2 cup coarsely chopped cilantro leaves and tender stems, divided; 2 1/4 tsp. kosher salt, divided; 3/4 tsp. chili powder, preferably chipotle, divided; 1 Tbsp. vegetable oil, plus more for greasing; 2 ears corn on the cob; 1 large tomato, chopped into 1/2 pieces; 1/2 small red onion, finely chopped; 1 avocado, halved, cut into 1/2 pieces; 1 serrano chile, seeded, finely chopped; 3 Tbsp. fresh lime juice