Preheat the oven to 425. Grease a mini muffin tin with butter.
In a frying pan with a little oil, cook the onion and celery to soften, about 5 minutes. Add in the sausage and cook until browned and cooked through.
Mix the flour, cornmeal, sugar, baking powder, salt, and baking soda in one bowl.
Mix the egg, sour cream, and frozen corn in another bowl. Pour the sour cream mixture into the flour mixture and stir well to combine.
Pour the batter evenly into 24 mini muffin spaces. Add about a tablespoon of sausage to the center of each. Bake about 12-15 minutes until set.
Meanwhile, stir together the sauce ingredients.
Remove the muffins from the tin and align on a serving dish. Drizzle the sauce on top. Serve.