Toss together the Brussels sprouts, broccolini, onion, olive oil and pumpkin spice butter.
Roast in a 425 degree F oven for about half an hour, stirring occasionally.
To serve the roasted vegetables, top with the cooked pancetta. Yum!
When I first made this Thanksgiving side dish, I used Country Crock Pumpkin Spice margarine. Unfortunately, they no longer make it so I now substitute this pumpkin spice butter for it. We like this butter on dinner rolls too! - https://tidymom.net/pumpkin-spice-butter-spread/