Oats with milk without microwave
A stove would be the traditional method for making oats and it doesn't require a microwave. It takes longer than the microwave but it works just fine, if not better (but this will vary by personal preference).

Add milk to a small pot, bring it to simmer, add oats to the pot, cook for recommended amount of time depending on the type of oats you're using (see package for times) or until they reach your preferred level of doneness. Some recipes have you add the oats and liquid at the same time and bring to a simmer together... either option works.

Make certain to keep the temperature low enough to not burn and stir occasionally to move them around. Milk is mostly water (about 87% in whole milk, higher in lower fat milks), so as long as you're not using extremely high heat and leaving it unattended for long periods of time, you should be fine.