Grilled Turkey and Swiss Sandwich with Caramelized Onions

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

A hearty sandwich featuring tender grilled turkey breast, nutty Swiss cheese, and sweet caramelized onions on toasted sourdough bread. This american-inspired sandwiches & wraps ready in about 35 minutes pairs sourdough bread slices, turkey breast slices, Swiss cheese slices for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 450 calories and feeds 2, 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.

Prep: 10 min Cook: 25 min Serves 2 American cuisine 450 cal/serving
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Ingredients

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Instructions

  1. Step 1: Heat 1 tbsp olive oil in a skillet over medium heat. Add 1 medium thinly sliced yellow onion with 1/4 tsp salt and 1/8 tsp black pepper. Cook, stirring occasionally, for 15 minutes until onions are soft and golden brown, stirring frequently towards the end to prevent burning.
  2. Step 2: Spread 2 tbsp Dijon mustard evenly on one side of each of the 4 sourdough bread slices.
  3. Step 3: Layer 2 oz sliced turkey breast and 1 slice Swiss cheese on two of the bread slices, then top each with half of the caramelized onions. Close sandwiches with the remaining bread slices, mustard side down.
  4. Step 4: Melt 2 tbsp unsalted butter in a clean skillet over medium heat. Place the sandwiches in the skillet and grill for 3-4 minutes per side until the bread is toasted golden brown and the cheese is melted, pressing gently with a spatula.
  5. Step 5: Remove sandwiches from skillet, let rest for 2 minutes, then slice in half and serve warm.

Frequently asked questions

How long does Grilled Turkey and Swiss Sandwich with Caramelized Onions take to make?

Total time is about 35 minutes (10 min prep + 25 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Grilled Turkey and Swiss Sandwich with Caramelized Onions?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep sourdough bread slices from drying out.

Can I substitute ingredients in Grilled Turkey and Swiss Sandwich with Caramelized Onions?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Grilled Turkey and Swiss Sandwich with Caramelized Onions for a different number of people?

The recipe is written for 2 servings. Multiply each ingredient by (your serving target / 2). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

What goes well with Grilled Turkey and Swiss Sandwich with Caramelized Onions?

American sandwiches & wraps like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.

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