Lemon-Thyme Roasted Pork Tenderloin with Garlic Mashed Potatoes

By AislePrompt Editorial · Published 2026-06-13 · Updated 2026-06-13

Tender pork tenderloin roasted with bright lemon and earthy thyme, served alongside creamy garlic mashed potatoes. This American-inspired pork recipe, ready in about 55 minutes, pairs pork tenderloin, olive oil, fresh thyme leaves for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 450 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 lbs pork tenderloin
• 2 tbsp olive oil
• 2 tsp, chopped fresh thyme leaves
• 1 tsp lemon zest
• 3, minced garlic cloves
• 1 tsp salt
• 1/2 tsp black pepper
• 2 lbs, peeled and quartered russet potatoes
• 4 tbsp butter
• 1/2 cup whole milk
• 1 tsp, for potatoes salt
• 1/4 tsp, for potatoes black pepper

The instant-read thermometer we’d check this pork with → Best Instant-Read Thermometers for 2026: Fast, Accurate Picks Under $100

Instructions

1. Step 1: Preheat oven to 400°F. In a small bowl, combine 2 tbsp olive oil, 2 tsp chopped fresh thyme leaves, 1 tsp lemon zest, 3 minced garlic cloves, 1 tsp salt, and 1/2 tsp black pepper. Rub this mixture evenly over a 1.5 lb pork tenderloin.
2. Step 2: Place the pork on a roasting pan or baking sheet and roast for 25-30 minutes, or until the internal temperature reaches 145°F. Remove from oven and let rest for 10 minutes before slicing.
3. Step 3: Meanwhile, place 2 lbs peeled and quartered russet potatoes in a large pot and cover with cold water. Add 1 tsp salt and bring to a boil over high heat. Reduce to medium and cook for 15-18 minutes until potatoes are fork-tender.
4. Step 4: Drain potatoes thoroughly, then return to pot. Add 4 tbsp butter, 1/2 cup whole milk, 1 tsp salt, and 1/4 tsp black pepper. Mash with a potato masher until smooth and creamy.
5. Step 5: Serve sliced pork tenderloin atop a bed of garlic mashed potatoes, spooning any resting juices over the meat.