Select saute setting on a 6-qt. electric pressure cooker and adjust for medium heat; then heat oil. Add potato and onion; cook and stir 4-6 minutes or until potato is lightly browned. Press cancel, Transfer to a greased 6- or 7-in. souffle or round baking dish (1 1/2-qt.). Wipe pressure cooker clean; pour in water., In a large bowl, whisk eggs, pepper sauce, salt and pepper; stir in ham, green pepper and 1/2 cup cheese. Pour over potato mixture. Top with remaining cheese. Cover baking dish with foil and place on a trivet with handles; lower into pressure cooker. Lock lid; close pressure-release valve. , Adjust to pressure-cook on high for 35 minutes. Allow pressure to naturally release for 10 minutes, then quick-release any remaining pressure.