Place olive oil and garlic in 23 cm microwave-proof pie plate. Microwave on HIGH (100% power) 45 seconds. Drain pinto beans, reserving one third cup of juices. Add beans and reserved juiced to garlic mixture in microwave-proof pie plate. Mash beans with potato masher until all are broken up. Stir in pepper. Cover with wax paper and microwave on HIGH 3 minutes. Stir well and smooth out top to make even. Makes 2 cups.