Preheat oven to 400˚F. Spread chili into an even layer in a 10” cast iron skillet. Set aside.
In a mixing bowl whisk together flour, cornmeal, sugar, baking powder, and salt.
Add butter and cut into the flour mixture until the mixture feels like sand.
Fold in sliced green onion.
Gently stir in the buttermilk until a dough form and no dry spots remain, careful not to over-mix.
Using an ice cream scoop, evenly scoop and dollop 1/2 cup amounts of batter over the chili.
Bake casserole for 20 minutes, remove from oven, and gently brush drop biscuits with melted butter.
Place biscuits back into the oven and continue to bake for an additional 10 to 14minutes or until chili is bubbling hot and biscuits have baked through.
Cool slightly before scooping and serving (with dollops of sour cream and sliced green onion)