Grilled Veggie and Swiss Cheese Whopper-Inspired Sandwich

By AislePrompt Editorial · Published 2026-04-27 · Updated 2026-04-27

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 developed and reviewed.

A hearty grilled sandwich featuring smoky charred vegetables, melted Swiss cheese, fresh lettuce, and a creamy mayo spread. This Brazilian recipe (vegetarian), ready in about 22 minutes, pairs zucchini, red bell pepper, red onion for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 400 calories and feeds 1, 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: 12 min Serves 1 American cuisine 400 cal/serving

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Ingredients

1 small, sliced lengthwise into 1/4-inch strips zucchini
1/2, cut into 1-inch strips red bell pepper
1/4, sliced into thin rings red onion
2 tbsp olive oil
1/2 tsp salt
1/4 tsp black pepper
2 Swiss cheese slices
2 iceberg lettuce leaves
2 tbsp mayonnaise
1 sesame seed bun

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Instructions

Step 1: Preheat a grill pan over medium-high heat and brush with 1 tbsp olive oil.
Step 2: Toss 1 small sliced zucchini, 1/2 red bell pepper strips, and 1/4 sliced red onion rings with remaining 1 tbsp olive oil, 1/2 tsp salt, and 1/4 tsp black pepper.
Step 3: Grill the vegetables on the hot pan for 3-4 minutes per side until tender and slightly charred.
Step 4: Lightly toast 1 sesame seed bun face down on the grill pan for 1-2 minutes.
Step 5: Spread 2 tbsp mayonnaise evenly on the bottom half of the bun.
Step 6: Layer 2 grilled zucchini strips, 2 grilled red bell pepper strips, and 2 grilled onion rings over the mayo.
Step 7: Place 2 slices of Swiss cheese on top of the vegetables and cover with the top half of the bun.
Step 8: Let the sandwich rest for 1 minute to allow the cheese to soften, then serve warm.