In a medium skillet, sauté the onions and pepperoni until onions are soft and pepperoni is starting to crisp. Drain and set aside.
In a medium bowl combine cream cheese, 1 cup shredded Mozzarella and Parmesan cheese. Mix until combined. Add pizza sauce and pepperoni onion mixture and stir well.
Add mixture to a 1 quart crock pot, or crockette. Add whole pepperoni slices to top of mixture and sprinkle with remaining mozzarella cheese. Plug in and let cook for 2 hours until cheese mixture is melty.
Make the garlic knots: Thaw Rhodes rolls according to package directions.
Once thawed, cut each roll in half and roll into a rope then gently tie into a knot. Place on a parchment or silicon mat lined baking sheet.
Bake at 350 degrees F. for 15 -20 minutes or until brown.
While baking melt butter and add garlic powder. Brush finished rolls with garlic butter. Serve with pizza dip.