Arkansas Fried Veggie Skillet

Name: Arkansas Fried Veggie Skillet
Prep time: 20 min
Cook time: 15 min
Total time: 35 min
Cuisine: Southern
Ingredients: 1 cup milk; 1 egg; 1 cup cornmeal, or as needed; 2 squash, sliced; 2 red potatoes, cubed; 2 green tomatoes, cubed; 3 pods fresh okra, sliced into rings, or more to taste; 0.5 onion, diced; 0.5 green bell pepper, diced; 2 tablespoons bacon grease, or as needed; salt and ground black pepper to taste