In a bread machine pan, place the first six ingredients in order suggested by manufacturer. Select dough setting (check dough after 5 minutes of mixing; add 1-2 tablespoons of water or flour if needed).
When cycle is completed, turn dough onto floured surface. Roll into 12-in. circle. Transfer to a 14-in. pizza pan coated with cooking spray. Cover; let rise in a warm place until doubled, about 30 minutes.
In a large skillet, cook onions and garlic in butter over medium heat for 15-20 minutes or until onions are golden brown, stirring frequently.
With the end of a wooden spoon handle, make indentations in dough at 1-in. intervals. Top with onion mixture and sprinkle with cheese. Bake at 400° for 15-20 minutes or until golden brown. Remove to a wire rack. Cut into wedges and serve warm.