In a skillet over medium-low heat, add 1 teaspoon butter. Add 1 tablespoon avocado to one slice of bread, and place it in the pan, avocado side up. Place the cheese and sliced sun-dried tomatoes on the bread. Spread the remaining avocado on the last slice of bread, and add it (avocado side down) to the one in the pan, creating a sandwich.
Press down on the sandwich with a spatula, and cover the pan for 2-3 minutes, or until the cheese melts. Pick the sandwich up with the spatula, and add the additional 1 teaspoon of butter to the pan. Flip the sandwich and press the sandwich down with the spatula.
Cover and cook for another 1-2 minutes until the cheese is melted and the bread is golden brown. Serve warm.
*Swiss cheese was used for the nutrient analysis
Serving size: 1 sandwich Calories: 520 calories, Fat: 35 grams, Saturated fat: 18 grams, Carbohydrates: 25 grams, Sugar: 3 grams, Sodium: 320 milligrams, Fiber: 6 grams, Protein: 23 grams, Cholesterol: 80 milligrams