1. Preheat your oven to 375°F (190°C). Grease a 9×13-inch baking dish and set aside.
2. In a large skillet over medium heat, cook the ground beef until browned. Drain excess fat.
3. Add the diced onion and garlic to the skillet and sauté until the onions become translucent.
4. Stir in the cooked bacon, mustard, Worcestershire sauce, salt, and pepper. Mix well and remove from heat.
5. In a separate bowl, whisk together the eggs and heavy cream until combined.
6. Spread the beef mixture evenly in the prepared baking dish. Pour the egg and cream mixture over the top, ensuring it covers the beef evenly.
7. Sprinkle shredded cheddar cheese over the casserole. If using pickles, add them now for a tangy touch.
8. Bake in the preheated oven for 25-30 minutes, or until the casserole is set and the cheese is bubbly and golden.
9. Let it cool for a few minutes before serving, allowing the flavors to meld beautifully.

One of my favorite tips from Mama Lou was to let the casserole rest for a bit before serving. This not only enhances the flavors but also makes it easier to slice and serve.