Heat oven to 400°.
Cook and stir ground beef in 10-inch skillet until brown; drain.
Drain tomatoes, reserving 1/4 cup liquid.
Stir tomatoes, reserved tomato liquid, corn (with liquid) and the remaining ingredients except green pepper rings into beef.
Heat to boiling; reduce heat.
Simmer uncovered, stirring constantly, until thickened, about 1 minute.
Spoon beef mixture into pastry-lined pie plate.
Bake until crust is golden brown, 25 to 30 minutes.
Garnish with green pepper rings.