Cornbread Chili Poke Bake

Name: Cornbread Chili Poke Bake
Ingredients: Nonstick cooking spray, for the baking dish; 3 cups stone-ground cornmeal; 1/4 cup sugar; 1 tablespoon baking powder; 1 tablespoon kosher salt; 1 teaspoon baking soda; 2 cups buttermilk; 1 cup vegetable oil; 4 large eggs; 1 tablespoon vegetable oil; 1 small yellow onion, grated; 1 pound ground beef (80/20); 2 tablespoons chili powder; 2 tablespoons tomato paste; 2 teaspoons chipotle chile powder; 2 teaspoons ground cumin; One 28-ounce can crushed tomatoes; 1 cup shredded Cheddar; 1/2 cup sour cream; 1 jalapeno, halved, seeded and thinly sliced; 2 scallions, thinly sliced