Baked Shepherd’s Pie with Caramelized Onion and Garlic Mashed Potatoes

By AislePrompt Editorial · Published 2026-05-09 · Updated 2026-05-09

A comforting baked shepherd’s pie featuring savory ground beef and vegetables topped with creamy garlic mashed potatoes enriched with caramelized onions. This British-inspired beef recipe, ready in about 80 minutes, layers ground beef, yellow onion, carrots into a dessert worth slowing down for — great for weekend baking, holiday tables, or any time you want a sweet payoff at the end of a meal. Each serving lands at about 460 calories and feeds 6, so it slots into a weekend bake or a special-occasion dessert tray. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Ingredients

• 1 lb ground beef
• 1 medium, diced yellow onion
• 2 medium, diced carrots
• 1 cup frozen peas
• 4, minced garlic cloves
• 2 tbsp tomato paste
• 1 cup beef broth
• 1 tbsp Worcestershire sauce
• 1 tsp, divided salt
• 1/2 tsp, divided black pepper
• 2 lbs, peeled and quartered Russet potatoes
• 4 tbsp butter
• 1/2 cup whole milk
• 2 tbsp olive oil
• 1 tsp, chopped fresh thyme leaves

The pan we’d use for this → Best Nonstick Cookware for 2026: Top 5 Skillet Picks + Buying Guide

Instructions

1. Step 1: Preheat oven to 400°F. Heat 2 tbsp olive oil in a large skillet over medium heat. Add 1 medium diced yellow onion and sauté for 10 minutes until deeply caramelized and golden brown, stirring occasionally.
2. Step 2: Add 4 minced garlic cloves and cook for 1 minute until fragrant. Add 1 lb ground beef and cook for 6-8 minutes, breaking it apart with a spoon until browned and cooked through. Season with 1/2 tsp salt and 1/4 tsp black pepper.
3. Step 3: Stir in 2 diced medium carrots and 1 cup frozen peas, cooking for 5 minutes until vegetables soften. Add 2 tbsp tomato paste, 1 cup beef broth, 1 tbsp Worcestershire sauce, and 1 tsp chopped fresh thyme leaves. Simmer over low heat for 10 minutes until the mixture thickens slightly.
4. Step 4: While the filling simmers, place 2 lbs peeled and quartered Russet potatoes in a large pot and cover with cold water. Add 1/2 tsp salt and bring to a boil over high heat. Cook for 15-18 minutes until potatoes are fork-tender.
5. Step 5: Drain potatoes and return to pot. Add 4 tbsp butter and 1/2 cup whole milk. Mash until smooth and creamy. Fold in the caramelized onion reserved from step 1 for extra flavor.
6. Step 6: Transfer the beef and vegetable filling to a 9x13-inch baking dish. Spread the garlic mashed potatoes evenly on top using a spatula. Use a fork to create texture on the surface.
7. Step 7: Bake uncovered for 25-30 minutes until the potato topping is golden and edges are bubbling. Let rest for 5 minutes before serving.