Roll out the pizza dough in a rectangular shape about 1/4 inch thick.
Spread the spaghetti sauce over the dough without going all the way to the edges. Leave a half-inch or so so that everything doesn't leak out and the edges will seal.
Sprinkle the mozzarella cheese evenly over the dough.
Place a layer of ham over the cheese. Follow this with a layer of salami, followed by a layer of pepperoni.
Roll the stromboli as tight as you can. Press the seams together and tuck under the ends. Gently place it on a large baking tray.
Melt the butter and add garlic powder to taste.
Brush the bread with the garlic butter.
Bake in a preheated 375-degree oven for 25-30 minutes until golden brown.
Notes
The prep time for this recipe includes making the pizza dough from scratch. If using store-bought dough the prep time will be about 10-15 minutes.