Comforting Shepherd's Pie Casserole
A cozy and practical family dinner featuring savory ground beef in a rich gravy, topped with a fluffy, golden blanket of cheesy mashed potatoes and tender mixed vegetables.
Equipment
- 1.5 quart casserole dish
- Large Skillet
- Potato masher or ricer
- Large Pot
Ingredients
- 1 pound white or russet potatoes, peeled and cut into about 1 inch chunks
- 1 pound ground beef
- 1/2 cup chopped onion
- 1 crushed or minced garlic clove
- 6 oz can of tomato paste
- 1/4 cup Worcestershire sauce
- 1 1/2 cups beef broth
- 4 cups frozen mixed vegetables (carrots, peas, corn, and green beans), thawed
- 1 cup shredded cheddar cheese, divided
- 1/4 cup Greek yogurt or sour cream
- 1/4 cup milk
- 1 teaspoon kosher salt
Instructions
Prep the Oven and Potatoes
- Preheat your oven to 350°F. Lightly coat a 1.5-quart casserole dish with cooking spray to ensure the filling releases easily.
- Place the potato chunks in a pot of cold salted water. Cover and bring to a boil, then cook uncovered for 10 to 12 minutes until the centers are fork-tender.
Build the Beef Filling
- While the potatoes boil, heat a skillet over medium heat. Add the ground beef, chopped onion, minced garlic, and a pinch of salt and pepper. Cook, breaking the meat into crumbles, until the beef is no longer pink and the onions are soft.
- Drain all excess grease from the skillet to keep the filling savory and clean.
- Stir in the tomato paste, Worcestershire sauce, and beef broth. Add the thawed mixed vegetables and simmer for 10 to 15 minutes until the sauce is glossy and thickened into a spoonable gravy.
Mash and Assemble
- Drain the cooked potatoes and return them to the warm pot for a moment to evaporate excess moisture. Add 1/2 cup of shredded cheddar, the Greek yogurt (or sour cream), milk, and 1 teaspoon of kosher salt. Mash until smooth, being careful not to overwork them.
- Transfer the beef and vegetable mixture into the prepared casserole dish. Spread the mashed potatoes evenly over the top, sealing the edges completely. Sprinkle the remaining 1/2 cup of cheese over the top.
Bake and Rest
- Bake for 30 to 35 minutes until the filling is bubbling and the cheese is lightly browned. Let the dish rest for 5 to 10 minutes before serving to allow the gravy and layers to set.
Notes
Flavor Secret: Caramelizing the tomato paste in the pan before adding liquid (a move called pincé) adds a deeper, more savory backbone to the gravy.
Texture Tip: Use a fork to create ridges in the mashed potato topping before baking. These peaks catch the heat and turn into crispy, golden bits.
Make-Ahead Instructions: This casserole can be assembled up to 48 hours in advance. Keep it refrigerated and bake just before serving. You can also freeze it tightly wrapped; just add 15 to 20 minutes to the baking time if cooking from frozen.
Storage: Leftovers keep well in an airtight container for up to 3 days. Reheat in a 350°F oven to keep the topping fluffy.
Nutrition information is estimated based on common ingredients and serving sizes and may vary.