Preheat oven to 350 degrees F (175 degrees C). Grease a 13×9-inch baking dish.
Cook and stir ground beef, sausage, onion, and bell pepper together in a large skillet over medium heat until the beef and sausage are completely browned and crumbled, 7 to 10 minutes. Drain grease from skillet and return to heat.
Stir flour, salt, oregano, and black pepper into the beef mixture. Pour spaghetti sauce over the mixture. Add mixed vegetables; bring mixture to a simmer and cook for 5 minutes. Transfer mixture to prepared baking dish.
Roll crescent dough into a flat layer atop the beef mixture; sprinkle with Cheddar cheese.
Bake in preheated oven until the dough is golden and the cheese is melted, about 30 minutes.
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