Weeknight Beef and Bean Casserole with Cornbread Topping

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1 pound ground beef

1/2 medium onion, chopped 

1 garlic clove, minced 

1 jalapeno, seeded and chopped 

1 can pinto beans, drained and rinsed 

2 cups tomato sauce, homemade or store-bought 

1 medium tomato, chopped 

1 cup grated Cheddar cheese 

1 cup self-rising cornmeal mix 

1/2 cup self-rising flour 

1 large egg 

1 cup buttermilk