Avocado Pesto Grilled Cheese Sandwich

Name: Avocado Pesto Grilled Cheese Sandwich
Cook time: 20 min
Total time: 20 min
Cuisine: American, Italian, European, Mediterranean
Ingredients: 8 slices whole wheat bread; 1/4 cup (60 ml) basil pesto; 1 (ripe) avocado, pitted, peeled, and thinly sliced; 1/2 cup (125 ml) shredded Canadian Mozzarella cheese; 1/2 cup (125 ml) shedded aged Canadian Cheddar cheese; 1/4 cup (60 ml) unsalted butter, softened