Let’s break down the process into easy-to-follow steps.

Step 1: Cook Potatoes and Garlic. Place the cubed potatoes and halved garlic cloves in a large pot with enough water to cover. Bring to a boil over high heat. Reduce heat to medium-low, cover, and simmer until tender, about 20 minutes.

Step 2: Preheat Oven. Preheat the oven to 375 degrees F (190 degrees C).

Step 3: Cook Ground Beef. Meanwhile, cook the ground beef in a skillet over medium heat, breaking it up with a spoon, until browned.

Step 4: Make Gravy. Stir the flour into the beef and drippings. Stir in the frozen mixed vegetables, beef broth, ketchup, salt, and black pepper until combined. Cook until thick, about 5 minutes.

Step 5: Transfer to Casserole Dish. Transfer the beef mixture to an oven-proof casserole dish.

Step 6: Mash Potatoes. Drain the cooked potatoes and garlic. Return them to the pot. Slightly smash the potatoes with a potato masher. Add the sour cream and ¼ cup of the Cheddar cheese. Mash until smooth.

Step 7: Top Beef with Potatoes. Top the beef mixture with the mashed potatoes, spreading them evenly from the center of the casserole to the edges to form the top layer.

Step 8: Add Cheese. Sprinkle the remaining ¼ cup of Cheddar cheese over the mashed potatoes.

Step 9: Bake. Bake in the preheated oven until the cheese melts and turns golden, 20 to 25 minutes.

Step 10: Cool and Serve. Let the Shepherd’s Pie cool for 15 minutes before serving.

These steps are simple and easy to follow.