In a small dish, combine butter and garlic. Mix well and set aside.
Bring a pan sprayed with nonstick spray to medium-high heat on the stove. Cook tomato slices for 1 to 2 minutes on each side, until lightly blackened.
Split English muffin into halves. Spread garlic-butter mixture evenly over both halves. Top each half evenly with mozzarella cheese strips.
Place three basil leaves on top of each cheese-topped muffin half, followed by tomato slices. Place halves on a baking sheet sprayed lightly with nonstick spray. Bake in the oven until the cheese has melted and muffin halves are toasty, about 5 minutes.
Finish off with a dash of salt and on top of each tomato, if you like.