I was worried about the bias of nutrition because I only ate two slices of bread or cereal for breakfast recently. So I decided to eat an egg every morning. It's a simple recipe that my mother taught me, first crack an egg into a small cup, second pour 50 cc of water into the cup, third heat the cup in microwave for 1 minute and 40 seconds, then you will get an easily cooked poached egg. That’s all. I eat this poached egg every day. I'm happy because my breakfast has better balance of nutrition and taste now.

( I'd like to know native-like expressions for these sentences. ) 聼起來自然嗎?

You did a good job but just needed to change a few word choices and phrasing of words 👍

I was worried about my lack of nutrition because I have only been eating two slices of bread or cereal for breakfast, so I decided to eat an egg every morning.
This is a simple poached egg recipe that my mother taught me, first crack an egg into a small cup, pour 50 cc of water into the cup, heat the cup in the microwave for 1 minute and 40 seconds, and the egg should be ready to eat. This is an easy recipe for poached egg that can be made every day. I'm happy because my breakfast has better balance of nutrition and taste now.