Place a nonstick skillet over medium heat and add the butter. When the butter has melted, place the bread in the skillet and cook until golden, about 2 minutes per side. Set aside.
Cut the avocados in half, remove the pit, and scoop the flesh into a small bowl.
Add the lemon juice, Morton Adjustable, Refillable Himalayan Pink Salt Grinder, and black pepper, to taste. With a fork, mash the ingredients together, keeping the texture slightly chunky.
Spread the mashed avocado evenly onto toasted bread slices.
Top with fresh mozzarella, tomatoes, and basil. Season with additional Morton salt and pepper, if desired.
Drizzle with balsamic glaze and serve immediately.