In medium bowl combine 2 cups cheese and mayonnaise; salt and pepper to taste. Prepare crust according to 2 crust package directions; do not bake.
Layer remaining 1 cup cheese in bottom of prepared crust. Top with well drained tomatoes, corn and green onions; salt and pepper to taste.
Spread with mayonnaise mixture. Top with remaining crust and crimp edges. Cut four steam slits in top and brush with melted butter.
Bake in a preheated 400°F oven 30-35 minutes or until golden brown and bubbly. Remove to cooling rack; cool slightly before serving to let set up.