This year is the first time we are doing a veggie garden. We always did tomotoes, but this year we also did Brussels sprouts, broccoli, cauliflower, eggplant, and squash. Our Brussels sprout plants have yellow flower-looking things coming out of them. It looks like we have some tiny Brussels sprouts, the size of a pea coming out too. Seeing how I have never done a veggie garden, I don't know if this is normal or not.
Yellow Flowers in Brussels Sprouts
Certified GKH Gardening Expert
They have bolted. The following articles should be of some help to you: https://www.gardeningknowhow.com/edible/vegetables/brussels-sprouts/how-to-grow-brussel-sprouts.htm