Grilled Turkey and Swiss Sandwich with Caramelized Onions

By AislePrompt Editorial · Published 2026-06-08 · Updated 2026-06-08

How this recipe was made — this recipe was drafted by AislePrompt's AI-assisted pipeline from technique templates and USDA-sourced nutrition data, and published by AislePrompt Editorial — see how AislePrompt recipes are drafted and published.

A hearty sandwich featuring tender grilled turkey breast, nutty Swiss cheese, and sweet caramelized onions on toasted sourdough bread. This American-inspired sandwich and wrap recipe, 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

4 sourdough bread slices
8 oz turkey breast slices
4 Swiss cheese slices
1 medium, thinly sliced yellow onion
2 tbsp unsalted butter
1 tbsp olive oil
1/4 tsp salt
1/8 tsp black pepper
2 tbsp Dijon mustard

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Instructions

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.
Step 2: Spread 2 tbsp Dijon mustard evenly on one side of each of the 4 sourdough bread slices.
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.
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.
Step 5: Remove sandwiches from skillet, let rest for 2 minutes, then slice in half and serve warm.