Herb-Roasted Pork Tenderloin with Garlic Mashed Potatoes

By AislePrompt Test Kitchen · Reviewed by AislePrompt Editorial · Published 2026-04-21 · Updated 2026-04-21

Tender pork tenderloin infused with rosemary and garlic, served alongside creamy mashed potatoes for a comforting family meal. This american-inspired pork ready in about 60 minutes pairs pork tenderloin, olive oil, finely chopped fresh rosemary for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 520 calories and feeds 4, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. 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

• 1.5 lb pork tenderloin
• 2 tbsp olive oil
• 1 tbsp, finely chopped fresh rosemary
• 4 cloves, minced garlic
• 2 lb, peeled and cubed potatoes
• 3 tbsp, unsalted butter
• 1/4 cup whole milk
• 1 tsp salt
• 1/2 tsp black pepper

Instructions

1. Step 1: Preheat oven to 400°F. Rub 1.5 lb pork tenderloin with 2 tbsp olive oil, 1 tbsp chopped rosemary, 4 minced garlic cloves, 1/2 tsp salt, and 1/4 tsp black pepper.
2. Step 2: Place pork on a baking sheet and roast for 25-30 minutes until internal temperature reaches 145°F, then let rest 10 minutes.
3. Step 3: While pork roasts, boil 2 lb peeled and cubed potatoes in salted water for 15-20 minutes until fork-tender.
4. Step 4: Drain potatoes and return to pot. Add 3 tbsp butter, 1/4 cup whole milk, 1/2 tsp salt, and 1/4 tsp black pepper. Mash until smooth and creamy.
5. Step 5: Slice rested pork and serve with a generous portion of garlic mashed potatoes and extra rosemary for garnish.