For the Gravy:

1. 1. In a large skillet over medium heat, brown the ground beef until fully cooked. Drain excess grease but retain some for flavor.
2. 2. Add the diced onion and minced garlic to the skillet. Sauté until fragrant and onions are translucent, about 5 minutes.
3. 3. Stir in Worcestershire sauce, salt, and pepper. Mix thoroughly.
4. 4. Pour in the beef broth and let it simmer for about 10 minutes until slightly thickened. For a thicker gravy, add a cornstarch slurry (equal parts water and cornstarch).

For the Mashed Potatoes:

1. 1. Boil peeled and cubed potatoes in salted water until fork-tender, about 15-20 minutes.
2. 2. Drain and return potatoes to the pot. Add butter and cream or milk.
3. 3. Mash until smooth and creamy; season with salt as needed.
4. Serve:
5. 1. Spoon the hamburger gravy generously over the fluffy mashed potatoes.
6. 2. Enjoy while hot!