daily dialog

A: What are we having for breakfast?

It's more natural to say "What are we having".

B:Sweet potatoes and bolided eggs.

B: Sweet potatoes and boiled eggs. 

I fixed a typo. It's "boiled", not "bolided". 

A:oh…again?I hate sweet potatoes, it tastes bad.

A: Oh... again? I hate sweet potatoes, they taste bad.

Because potatoes is plural, "it" should be "they". It = one thing. They = multiple.

B:I don’t understand why you always say that !I means, they tastes sweet and have good taste. And the most important thing is they are healthy food! They can help to control your blood sugar!

B: I don't understand why you always say that! (Or you could more simply say, "I don't get why you always say that!") I mean, they taste sweet and are delicious. Most importantly, they're healthy! They can help control your blood sugar!

"I mean" doesn't have an s at the end. Also, to sound more natural, you can say something is delicious or good. We don't usually say that things have "good taste", although that is a phrase used when talking about preferences. For example, if someone likes jazz music and you also like it, you could say that they have good taste in music.

A: OK,OK, you win. I just eat the stupid sweet potatoes.

A: Okay, okay, you win. I'll just eat the stupid sweet potatoes.

OK isn't wrong, but I think when writing, it's usually better to write it out as "okay." Also, I will just eat, since you're going to eat.

B: Good boy.

I hope these corrections help a bit! Feel free to let me know if you have any questions. ^^