Egg, Avocado, and Tomato Breakfast Sandwich with Swiss

This breakfast sandwich—built on a crisp whole wheat English muffin and layered with creamy avocado, a ripe tomato slice, melty Swiss cheese, and a gently cooked egg—quickly became a favorite. It balances textures and flavors: the crunch of the toasted muffin, the softness of avocado, the mild nuttiness of Swiss, the bright freshness of tomato, and the rich, runny yolk. Whether you need a satisfying weekday morning meal or a leisurely weekend brunch, this simple vegetarian sandwich delivers on taste and convenience.

Breakfast Sandwich with Egg, Avocado, Tomato, and Swiss Cheese

Ingredients:

• 1 tsp butter or cooking spray
• 1 large egg
• Cayenne pepper, to taste
• Sea salt and freshly cracked black pepper, to taste
• 1 tsp water
• 1 whole wheat English muffin, split and toasted
• 1 slice Swiss cheese
• 1 slice ripe tomato
• 3 slices avocado (about 1/4 to 1/2 an avocado)

How to Make a Breakfast Sandwich with Egg, Avocado, Tomato, and Swiss Cheese

Start by heating the butter or spraying a small nonstick skillet over medium heat. Gently crack the egg into the skillet (or into an egg ring if you prefer a perfectly round shape). Season with a pinch of cayenne for a subtle kick, plus sea salt and freshly cracked black pepper to taste.

Once the egg white becomes opaque around the edges, add the teaspoon of water to the skillet and immediately cover with a lid. The steam will help cook the top of the egg while keeping the yolk soft and slightly runny. Cook for about one minute after covering, or until the yolk is clouded over but still soft—avoid overcooking if you want a creamy center.

While the egg finishes, toast the English muffin halves until golden brown. If you like, lightly spread butter on the warm muffin for extra flavor. Place a slice of Swiss cheese on the bottom muffin half so it begins to soften from the retained heat.

Assemble the sandwich by placing the cooked egg on top of the cheese, followed by the tomato slice and avocado slices. Season the tomato and avocado with a little sea salt and freshly cracked pepper to enhance their flavors. Top with the remaining muffin half and press down gently to meld the layers. Serve immediately so the cheese is melty and the yolk still adds a silky richness to each bite.

This sandwich is delicious as-is, but there are easy variations and tips to customize it. For a sharper flavor, swap Swiss for cheddar or Gruyère. Add a handful of fresh greens like baby spinach or arugula for extra color and nutrients. For a heartier version, include a smear of hummus or a few slices of smoked salmon if you eat fish. If you prefer a fully set yolk, cook the egg a bit longer under the lid until the yolk reaches your desired firmness.

To prepare this sandwich ahead, toast the muffin and slice the tomato and avocado in advance. Keep avocado slices covered with a little lemon juice to slow browning, and warm the assembled sandwich briefly in a low oven or skillet to melt the cheese before serving.

Enjoy this versatile breakfast sandwich any day of the week. It’s quick to make, packed with flavor, and easy to adapt to your preferences—making it a dependable favorite for busy mornings or relaxed brunches alike.