Favorite breakfast options

Hi all, first time poster. I have a huge question for you all. What's your favorite grab and go breakfasts? What's your favorite ones to sit and eat? I'm new to this whole thing and I used to eat belvita from Sam's Club that that's obviously no longer an option since it makes me sick now. I'm about to start a new job soon so anything helps. Also if you have suggestions for easy lunches/meal prep options I'd love to have them. TIA.