1/4 cup sliced red onion
2 1/4 teaspoons garlic powder
1 teaspoon dried oregano
2 scallions, chopped
1/2 (16 ounce) package shredded mozzarella cheese
1 cup shredded mozzarella cheese blend
1 cup Italian-style salad dressing
Melt 2 teaspoons garlic powder in a medium mixing bowl. Set aside.
Mix crushed mozzarella cheese, cheese and salad dressing in small bowl. Spread cheese mixture over roast; cover and refrigerate overnight.
Stir roast and salad mixture into two separate casserole pans.
Place one end of roast in each casserole dish, sandwiching half of cheese mixture over both end and half of casserole mixture. Serve hot warmed.