📖 Instructions

1. Prep Your Oven and Pan: First things first, get your oven heating up! Preheat it to 400°F (200°C). While it's getting nice and hot, grab a large, sturdy sheet pan. If you're worried about sticking or hate scrubbing, line it with parchment paper for super easy cleanup.
2. Chop the Veggies: Wash your bell peppers thoroughly. Cut them in half, remove the seeds and the white membrane inside, then slice them into about 1-inch thick strips. Next, peel and quarter your onion, then slice those quarters into similar-sized pieces. Don't worry too much about perfection; rustic chunks are totally fine!
3. Slice the Sausage: Take your Italian sausages and cut them into 1-inch thick rounds. If you're using larger, uncooked sausages, you might want to cut them a little thinner, perhaps 3/4-inch, to ensure they cook through evenly with the veggies.
4. Combine and Season: In a really big mixing bowl, toss all those glorious ingredients together: the sliced sausage, the bell pepper strips, and the onion pieces. Drizzle everything with olive oil – about 2 tablespoons should do it, but you can add a tiny bit more if things look too dry. Now, for the flavor! Sprinkle in the garlic powder, dried oregano, salt, and black pepper. Use your clean hands or a pair of tongs to toss everything until it’s all evenly coated. Make sure every piece gets some of that yummy seasoning!
5. Spread on the Pan: Now, carefully spread the seasoned sausage and vegetable mixture onto your prepared sheet pan. Here’s a crucial tip: make sure everything is in a single layer. Don’t overcrowd the pan! If it looks too full, grab a second sheet pan. Overcrowding will steam the vegetables instead of roasting them, making them soggy rather than beautifully caramelized and tender.
6. Roast to Perfection: Pop that sheet pan into your preheated oven. Let it roast for about 20-25 minutes. At this point, pull the pan out and give everything a good stir or flip with tongs. This helps ensure even browning. Put it back in the oven for another 15-20 minutes, or until the sausages are cooked through (no pink inside!) and nicely browned, and the peppers and onions are tender with some lovely charred edges. The veggies should look vibrant and slightly softened, but not mushy.
7. Rest and Serve: Once cooked, carefully remove the sheet pan from the oven. Let it rest for just 5 minutes. This little pause lets the flavors settle and everything become even more delicious. Garnish with a sprinkle of fresh parsley if you have some—it adds a nice pop of color and freshness. Then, scoop it directly onto plates and serve immediately!