Preheat oven to 425 degrees F and peel/chop all veggies, apples and herbs and slice up sausage links.: When the oven reaches 425 degrees F you want a strong, dry heat so the edges of the butternut squash and brussels sprouts crisp while interiors become tender; you'll hear slight crackling as the tray hits the heat. Prepare uniform pieces to promote even caramelization, peel the squash carefully so it roasts to a creamy interior, and slice the apple chicken sausage into coins so they expose more surface to brown. One common mistake is uneven chopping, which leads to mixed doneness; take a few extra minutes to match sizes. Avoid crowding the pan which causes steaming rather than roasting, and line the sheet if you prefer easier cleanup.
In a small bowl, whisk together the olive oil, maple syrup, dijon mustard, garlic and onion powder. Set the aside.: The glaze should look glossy and slightly viscous as the olive oil emulsifies with the maple syrup and dijon mustard , coating the minced garlic and onion powder so each piece picks up flavour. You should smell a bright, sweet tang with the mustard cutting through the syrup; this aroma is a good indicator that the components are balanced. A frequent error is under whisking, which leaves oil separated and causes uneven coating; whisk until smooth and homogeneous. If the glaze is too thick, a splash more oil will loosen it, but be mindful not to dilute the flavour.
Spread out the chicken sausage, veggies and apples onto a large baking sheet (you can line the sheet with aluminum foil for easy clean up), drizzle with maple mustard glaze and sprinkle with fresh herbs, tossing everything together.: As you arrange the ingredients on the sheet, make sure there is space between pieces so hot air can circulate and surfaces brown; the pan should look like a single layer with colorful clusters. Drizzling the glaze creates shiny pockets that will caramelize, and tossing ensures the fresh sage , thyme , and rosemary stick to the food rather than burning in clumps. You will begin to sense the sweet maple scent as the syrup touches warm metal. A typical misstep is piling items; reduce crowding by using two pans if necessary. Also, avoid pouring glaze unevenly which can leave some pieces under seasoned and others overly sweet.
Season with salt and pepper and roast in the oven for 30 minutes, tossing everything halfway through. Serve immediately and enjoy!: Once the tray is in the oven you'll see edges turn golden, the brussels sprouts will darken where their leaves kiss the pan, and the butternut squash will release a nutty perfume as its sugars caramelize; shifting the contents at the halfway point promotes even browning and prevents burning on hot spots. Use a sturdy spatula to turn pieces gently, listening for a soft sizzle as sticky bits recontact the metal, which is an excellent sign of caramel development. A common trap is opening the oven too often, which drops temperature and lengthens cook time; limit checks to the halfway toss and a final look. If you notice any pieces charring too quickly, rearrange them away from the edges or reduce the temperature slightly for the final minutes.
Serve immediately and enjoy: The finished tray should present a mosaic of golden butternut squash , crisped brussels sprouts , browned apple chicken sausage coins, and glossy, slightly sticky honeycrisp apples . Serve right away so textures remain distinct, and breathe in the warm, herb infused scent that signals balance between sweet and savory. A common oversight is waiting too long to serve, which softens the crisp edges and mutes the contrast; plating promptly preserves the texture and the bright herb aroma. If you need to hold it briefly, warm the oven to low and keep the tray inside for a few minutes to maintain temperature without drying.