Mash avocados in a large bowl. Add onion, lime juice, jalapeno, cilantro, garlic, salt, and pepper. Mix until well combined. Stir tomato into the guacamole.
Spread desired amount of guacamole over 2 bread slices; top each with 2 slices Havarti cheese. Cover with the remaining 2 slices bread; butter the outsides.
Heat a skillet to medium-high heat. Cook sandwiches until golden brown on the bottom, 2 to 3 minutes. Flip and cook until other side is browned, 2 to 3 minutes more.
Nutritional Facts
Per 2 servings
Calories: 755
Carbohydrate: 47g
Fat: 58g
Fiber: 16g
Protein: 21g
Sugar: 5g
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