Thaw frozen bread in the refrigerator covered per the package instructions. Cut each loaf into 9 equal pieces. (See Cook's note)
Lay dough pieces side by side and press together to form roughly two 10 x 16 inch rectangles.
Brush the entire surface of each rectangle with melted butter. Sprinkle each side with 1 Tbsp Parmesan cheese, and ¼ tsp garlic salt..
Sprinkle one side of dough with ½ cup shredded mozzarella cheese. Arrange pepperoni slices over the cheese then sprinkle with another ½ cup mozzarella cheese.
Carefully, cover with the second piece of dough to form the top. Press the edges to seal.
Use a pizza cutter or sharp knife to cut from top to bottom through the middle.
Next, cut the dough crosswise into approximate 1-inches thick strips. Separate the pieces and twist. Tuck any loose pieces of cheese into the dough.
Arrange the twisted bread sticks side by side in a buttered 13 x 9 inch baking pan. Brush the tops with remaining butter.
Sprinkle the top with remaining ¼ tsp garlic salt, dry Italian seasoning and last 1 cup mozzarella cheese. Cover with plastic wrap and let rise for 1 hour.
To prepare: Preheat the oven to 350°F. Remove the plastic wrap. Bake bread sticks for 25-35 minutes or until golden and cooked through.
Pull apart and serve with warm pizza sauce for dipping.