Cheesy Shrimp Dip

1/4 cup (1/2 stick) butter
2/3 cup chopped red bell pepper
1 pound medium fresh shrimp, peeled, deveined, and coarsely chopped
1/3 cup sliced green onion
1 cup sour cream
1 cup shredded Parmesan cheese
1 cup shredded mozzarella cheese
1/2 cup mayonnaise

Preheat oven to 350 degrees.
In a medium skillet, melt butter over medium heat. Add red bell pepper, and cook 3 minutes.
Stir in shrimp and green onion; cook 3 to 4 minutes, or until shrimp are firm and pink. Stir in sour cream, cheeses and mayonnaise. Spoon mixture into a 2-quart baking dish. Bake 30 to 35 minutes, or until lightly browned and bubbly. Serve with fritos or assorted crackers.