Beef and Mashed Potatoes Casserole

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1. 1Step 1: Preheat the oven to 375 degrees.
2. 2Step 2: In a large pot, cook the potatoes in salted water until fork tender. Once done, let them cool slightly, just enough to handle, then peel them.
3. 3Step 3: While still hot, mash the potatoes in a bowl and set aside.
4. 4Step 4: In a saucepan, heat the heavy cream and cream cheese, whisking until the cream cheese dissolves.
5. 5Step 5: Add the cream mixture to the potatoes and mix well until smooth.
6. 6Step 6: Season with salt and pepper and set aside.
7. 7Step 7: In a large skillet, heat the butter and sauté the garlic and onions until translucent.
8. 8Step 8: Add the tomatoes and herbs and cook for about 2 minutes.
9. 9Step 9: Add the ground beef and cook until browned, about 10 minutes.
10. 10Step 10: Add the flour, parmesan cheese, and crushed tomatoes.
11. 11Step 11: Cook until the sauce thickens slightly.
12. 12Step 12: Add the egg yolk and season with salt and pepper.
13. 13Step 13: Transfer the beef to a seasoned 12-inch cast iron skillet.
14. 14Step 14: Top with the mashed potatoes and then with the mozzarella.
15. 15Step 15: Bake for 30 minutes or until the cheese has melted and browned.