Preheat oven to 400° F. Line a large sheet pan with parchment paper.
Add the sausage, Brussels sprouts, carrots, sweet potatoes, and butternut squash to the sheet pan. Use your hands to create as even a single layer as possible, but it's okay if the ingredients are touching and overlapping.
Distribute the 3-4 tablespoons of avocado oil as evenly as possible over the sheet pan, coating as many items as possible. Repeat with the sea salt.
Roast at 400° F for 35-40 minutes, until all vegetables are fork tender and starting to brown. You can toss the vegetables after they have been roasting for 20 minutes, however it's not necessary and I usually do not. Serve warm and enjoy!