Overnight oats can be enjoyed either cold or warm, depending on personal preference. The classic way of serving overnight oats is a cold version. It can be especially nice during the hot summer months. But if you prefer a warm and comforting breakfast, you can heat up the overnight oats in the microwave. Simply transfer the oats to a microwave-safe dish and warm them up until they reach your desired temperature. And only then top it with yogurt.\r