I wouldn't roast the Brussels sprouts in advance, because I find that they develop an unpleasant cabbage-y smell and taste, as soon as within a few hours of being cooked.
That said, there's no reason not to prepare all of the rest of it, and then roast the Brussels sprouts alone on a baking sheet to fold into the dish right before popping it into the oven to bake. You can also prep the Brussels sprouts up to a few days in advance. I just answered another question on this very topic; see this for more details:
Hi nancy, you can find other people's thoughts on this very question on a couple of Hotline threads, see here: https://food52.com/hotline/22530-a-question-about-a-recipe-butternut-squash-brussels-sprout-and-bread-stuffing-with-apples and here: https://food52.com/hotline/22617-a-question-about-a-recipe-butternut-squash-brussels-sprout-and-bread-stuffing-with-apples
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That said, there's no reason not to prepare all of the rest of it, and then roast the Brussels sprouts alone on a baking sheet to fold into the dish right before popping it into the oven to bake. You can also prep the Brussels sprouts up to a few days in advance. I just answered another question on this very topic; see this for more details:
https://food52.com/hotline/29677-a-question-about-a-recipe-roasted-brussels-sprouts-with-pancetta-and-garlic-croutons
Let us know what you do, and how it turns out! ;o)