Prepare Ingredients: Gather all your ingredients, including your choice of bread, cheeses, sun-dried tomatoes, cooked bacon, and pesto.

Crisp Bacon: In a skillet over medium heat, cook bacon strips until golden brown and crispy, about 5-7 minutes. Drain on paper towel.

Make Pesto (if homemade): Blend fresh basil, garlic, nuts, olive oil, and cheese in a food processor until smooth.

Assemble Sandwich: Spread pesto on one slice of bread, layer with cheese, bacon, and sun-dried tomatoes, then top with another slice.

Grill Sandwich: Heat butter in a skillet, grill sandwich for about 3-4 minutes on each side until bread is crispy and cheese is melted.

Slice & Serve: Let sandwich cool for a minute, then slice in half and serve hot.