- Preheat oven to 400 degrees. Spray a baking sheet with non-stick spray. 
- In a medium skillet, heat butter or oil over medium heat. 
- If your shrimp is raw: removed tails if necessary and then season shrimp with Old Bay Seasoning, to taste. Saute shrimp 2 minutes on each side, until pink and cooked through. Remove and set aside. 
- If your shrimp is already cooked: remove tails, if necessary and then season with Old Bay Seasoning, to taste. Heat shrimp in skillet until hot, about a minute per side. Remove and set aside. 
- In same skillet add the bell pepper and onion sprinkle a little Old Bay Seasoning on the vegetables, to taste. 
- Cook just 2-3 minutes till softened a little. Remove from heat and set aside. 
- Unroll dough onto prepared baking sheet or pizza pan. Bake 5 minutes. 
- Remove partially baked crust from oven and spread Alfredo sauce over crust. 
- Lay the spinach on top of the sauce followed by the shrimp, bell pepper and onion mixture. Top pizza with mozzarella cheese. 
- Place pizza back into oven and bake 8 to 12 minutes longer or until cheese is melted and crust is browned. 
- Cut and serve.