How To Thaw Frozen Fruit For Oatmeal. For every ¼ cup of frozen fruit in your overnight oats, reduce the liquid by 2 teaspoons. Now, raspberries and blueberries should defrost faster and it only takes one microwave zap to thaw them.

Change the water every 20 minutes or leave the bowl in the sink under running water until the fruit is fully defrosted. You can thaw the fruit in its package if you need all of the fruit, or measure out how much you need in a sealable plastic baggie and place it in the refrigerator. If you don't want to microwave, thaw fruit the night before.