Shepherd’s Pie with Caramelized Onion and Thyme

By AislePrompt Editorial · Published 2026-05-08 · Updated 2026-05-08

A hearty shepherd’s pie featuring tender ground beef simmered with caramelized onions and fresh thyme, topped with buttery mashed potatoes baked to golden perfection. This British-inspired beef recipe, ready in about 70 minutes, layers ground beef, yellow onion, garlic cloves 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 480 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 large, thinly sliced yellow onion
• 3, minced garlic cloves
• 1 tbsp, chopped fresh thyme
• 2 medium, diced carrots
• 1 cup frozen peas
• 2 tbsp tomato paste
• 1 cup beef broth
• 2 tbsp all-purpose flour
• 3 large, peeled and quartered russet potatoes
• 4 tbsp unsalted butter
• 1/2 cup whole milk
• 1 tsp salt
• 1/2 tsp black pepper
• 2 tbsp olive oil

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Instructions

1. Step 1: Preheat oven to 400°F. In a large skillet, heat 2 tbsp olive oil over medium heat. Add 1 large thinly sliced yellow onion and cook for 15 minutes, stirring occasionally, until golden and caramelized.
2. Step 2: Add 3 minced garlic cloves and 1 tbsp chopped fresh thyme to the skillet, sauté for 1 minute until fragrant. Stir in 1 lb ground beef, breaking it up with a spoon, and cook until browned, about 6-7 minutes.
3. Step 3: Sprinkle 2 tbsp all-purpose flour over the beef mixture and stir for 2 minutes to cook the flour taste. Add 2 tbsp tomato paste and 1 cup beef broth, stirring to combine. Add 2 diced medium carrots and 1 cup frozen peas, simmer for 10 minutes until thickened and vegetables are tender. Season with 1 tsp salt and 1/2 tsp black pepper.
4. Step 4: Meanwhile, place 3 large peeled and quartered russet potatoes in a large pot and cover with cold water. Bring to a boil and cook for 15-20 minutes until tender. Drain, then mash with 4 tbsp unsalted butter and 1/2 cup whole milk until smooth and creamy.
5. Step 5: Transfer the beef and vegetable mixture to a 9x9-inch baking dish. Spread the mashed potatoes evenly over the top, smoothing with a spatula.
6. Step 6: Bake in the preheated oven for 20 minutes until the top is lightly golden and edges are bubbling. Let rest 5 minutes before serving.