How do YOU cook pre-marinated chicken breasts?

My only experience cooking boneless skinless chicken breasts is using an indoor grill when I mainly used (terrible, I know) pre frozen chicken breasts for meal preps years ago which turned out ok every time.

I'm trying to meal prep for my guy and honestly I keep messing up the chicken lol. Ive cooked them on the stove but that didn't turn out great (followed a recipe online). Well, I recently went to a great butcher and got some fresh pre-marinated breasts that I don't want to screw up.

How would you cook them? What's your favorite method? Should I bake them? Or bust out the indoor grill?