Heat oven to 350°F. Line cookie sheet with foil. Place dough, seam side down, on cookie sheet.
Cut half-inch deep slashes 1 inch apart with sharp knife on top of dough. In small bowl, mix melted butter and garlic salt. Brush on top of dough. Insert cheese into each slash.
Bake 25 to 27 minutes or until deep golden brown and cheese is bubbly. Cool 5 minutes before slicing.