Preheat the oven to 375°F (190°C).
Heat olive oil in a large skillet over medium heat.
Add diced onion and minced garlic to the skillet and sauté for 3-4 minutes until softened.
Add ground beef to the skillet and cook until browned, breaking it apart with a spoon, about 6-8 minutes.
Add diced green bell pepper, zucchini, mushrooms, and cauliflower to the skillet. Cook for 5 minutes, stirring occasionally.
Season the mixture with dried oregano, dried basil, salt, and black pepper. Stir well to combine.
In a separate bowl, whisk together heavy cream and softened cream cheese until smooth.
Pour the cream mixture into the skillet with the beef and vegetables. Stir well to combine and cook for 2-3 minutes until the sauce thickens slightly.
Transfer the beef and vegetable mixture into a 9×9 inch casserole dish.
Sprinkle shredded cheddar cheese evenly over the top of the casserole.
Bake in the preheated oven for 20-25 minutes, or until the cheese is melted and bubbly.
Remove from the oven and let cool for 5 minutes before serving.