01 -
Heat a large skillet over medium heat. Add diced onion and ground beef, cooking while stirring frequently and breaking up the meat until no longer pink, about 7 to 10 minutes. Drain excess fat thoroughly.
02 -
Incorporate Worcestershire sauce, beef bouillon powder, onion powder, garlic powder, salt, and black pepper into the cooked beef and onions. Stir to combine evenly. Add tomato sauce, ketchup, yellow mustard, and brown sugar. Mix well and adjust seasoning if needed. Allow filling to cool until warm but not hot to avoid dough melting.
03 -
Preheat oven to 425°F. Line a large baking sheet with parchment paper or lightly oil it. Unroll pizza dough onto the sheet and stretch gently into an even rectangle. Spread half the shredded cheese over the dough, leaving a border for sealing. Evenly layer the cooled sloppy joe filling on top, then sprinkle remaining cheese.
04 -
Fold dough edges inward, slightly overlapping, and pinch or fold under to close the sides tightly. Press to seal. Cut 4–5 slits in the top to vent steam. Brush entire surface with melted butter for a glossy, flavorful crust.
05 -
Bake stromboli in the preheated oven for 15 to 20 minutes until golden brown and crust sounds hollow when tapped. Let rest briefly before slicing into portions. Serve warm.