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Bacon sandwich on a croissant with melted Swiss cheese, lettuce, tomato, avocado, and mayo.
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Bacon Avocado Croissant Sandwich (with Vegetarian Option)

Inspired by my favorite coffee shop order, this bacon avocado croissant sandwich is flaky, savory, and deeply satisfying. Made with crispy bacon and melted Swiss cheese (with a vegetarian option included), it's a flexible meal that balances richness with freshness and works well for breakfast, brunch, or lunch.
Course Breakfast, brunch, lunch
Cuisine American
Prep Time 5 minutes
Cook Time 20 minutes
Total Time 25 minutes
Servings 1 sandwich
Calories 618kcal
Author Stephanie McKercher, RDN

Equipment

  • Knife and cutting board
  • Air fryer or oven

Ingredients

  • 2 strips bacon (regular or plant-based)
  • 1 slice Swiss cheese
  • 1 croissant, warmed (see note 1) and sliced in half lengthwise
  • ¼ cup mashed avocado (½ small)
  • 1 tablespoon garlic aioli or mayonnaise
  • 2 slices tomato
  • ¼ cup spring mix or baby spinach

Instructions

Air Fryer Bacon Instructions:

  • Place bacon in a single layer in the air fryer basket. Cook at 375 degrees Fahrenheit for 7 minutes, or until crispy. If using plant-based bacon, follow the package instructions.
  • Top the bacon with Swiss cheese and cook an additional 30 seconds, or until melted. Open and close the air fryer slowly to prevent the bacon and cheese from shifting. You may need to gently adjust the cheese placement once it starts melting.

Oven Bacon Instructions:

  • Preheat the oven to 400 degrees Fahrenheit and arrange the bacon in a single layer on a lined baking sheet. Bake for 15-20 minutes, or until crispy. If using plant-based bacon, cook according to package instructions.
  • Top the bacon with Swiss cheese and return to the oven to cook for an additional 2 minutes, or until melted.

Assemble Sandwich:

  • Spread mashed avocado on the bottom half of the opened croissant, and spread aioli on the top half.
  • Layer sliced tomato and spring mix on top of the mashed avocado.
  • Transfer the cooked bacon and melted Swiss cheese to the croissant. Close the sandwich and slice it in half if desired.

Notes

  1. To warm croissant: 
    1. Air Fryer: Place croissant in the air fryer basket and cook at 300ºF for 2 minutes, or until warmed.
    2. Oven: Preheat oven to 350ºF and place croissant on a baking sheet. Transfer to the oven and bake 5 minutes, or until warmed. 
    3. Stovetop: Melt butter in a skillet over medium heat. Slice the croissant in half lengthwise and place cut-side down in the skillet. Cook 2 minutes, or until warmed. 
  2. Making ahead and storage: This sandwich is best assembled fresh for optimal texture. If you need to store leftovers, wrap tightly and refrigerate for up to 1 day. Reheat in the oven or air fryer at 350ºF until warmed through.
  3. Serving Suggestions:
    1. Vanilla Matcha Latte
    2. Easy Spiced Oat Milk Latte
    3. High-Protein Strawberry Banana Smoothie with Greek Yogurt
    4. Quick and Easy Greek Yogurt Bowls with Berries
  4. Nutrition facts are estimates only. 

Nutrition

Calories: 618kcal | Carbohydrates: 34g | Protein: 16g | Fat: 46g | Saturated Fat: 17g | Polyunsaturated Fat: 4g | Monounsaturated Fat: 16g | Trans Fat: 0.1g | Cholesterol: 88mg | Sodium: 680mg | Potassium: 494mg | Fiber: 5g | Sugar: 8g | Vitamin A: 1200IU | Vitamin C: 14mg | Calcium: 186mg | Iron: 2mg