“Because there are only a few ingredients in this recipe, you’ll get the best results if you use the finest-quality foods, like a fresh Vidalia onion and aged Parmesan cheese.” —Lisa Speer, Palm Beach, Florida
In a large cast-iron or other ovenproof skillet, saute onion in butter and 1 tablespoon oil until softened. Reduce heat to medium-low; cook, stirring occasionally, until golden brown, 15-20 minutes. Set aside.
Brush bottom and sides of skillet with remaining oil. Unroll crust into skillet; flatten crust and build up edge slightly. Top with onion mixture and cheese. Bake at 450° until golden brown, 10-12 minutes. Cut into 4 wedges.