Given the background description of some cooking related query, summarize the question into a title

I love to make chicken stuffed with pesto. I cut the chicken breast in half, and then fill them with pesto and make a roll of it. I first bake the chicken in a frying pan to give them a nice color, and then put them in the oven to cook until it's done.However here comes my problem, I want the chicken to be totally done, because I am very afraid to eat raw chicken. However, I now cook them too long to be sure it is not raw anymore. I cook them for at least 20 minutes on 175 degrees Celsius. I was wondering, can anybody tell me how long I should cook them in the oven on which temperature to be sure it is not raw anymore, but not cook them overdone?
cooking time for chicken-pesto in the oven

I have always roasted my beets in a bit of vinegar in the bottom of the pan like 1/4" or so. It is how I was taught. But why do it? What does the vinegar do for the beets?
Why roast beets in vinegar?

I'm making some saffron rice. After sautéing some onions and saffron and then toasting the rice, it calls for simmering with broth for 8 minutes with a parchment lid. What is the difference between a parchment lid and a top? Is it just the vent for steam? If so, can I just partially cover with a lid? Does the parchment need to be directly resting on the rice for it to "work"?note: I know what a parchment lid is, I just don't fully understand why you'd use one.

What's the purpose of a parchment lid?

