As long as you leave sufficient room to plant, grow and harvest the veggies without disturbing the lily bulbs, they will be fine. You will see no sign of the lilies above ground until well after the veg have been harvested. The only risk is potential damage to the bulbs themselves should they be planted too close and somehow get interfered with during the planting/harvesting of the vegetables. But that's a risk you run when planting lilies amongst any other types of plants as well. I'd be sure to leave some sort of visible indication of were exactly the bulbs are planted to make sure that doesn't happen accidentally.

Thank you! I don't think they have deep roots so I will harvest with care and go ahead and plant around them -- especially since there's some space between them. I was mainly not sure if those bulbs needed sun while just planted or how that really worked out. I could only found one source online to say "Oh, foliage won't show up until spring" and wanted to confirm as well.

I marked the bulbs with a layer of lighter compost so I'll be able to find them. I'll plant around them for sure.

I'll also be careful with watering. Soil is dense but has good drainage to it; bearded iris bulbs are absolutely thriving nearby.

Much appreciated! I've grown chard but never Brussels sprouts. I know they get big and leafy and to cut those leaves back when they are taller.