Child not eating her breakfast

My child, 2yo, is a picky eater. I’m constantly comparing her with her older brother. I would love her to eat what I offer but she may or may not eat it. This gets on my nerves especially in the morning when I’m in a hurry to take them to school as she takes forever to eat some meals. I sent her cookies to school for snack, because that’s what the school suggested, because of covid.

Sometimes I make this a power struggle, what to do? Please help!