Preheat oven to 400.
Place the broccoli florets on silicone baking mat on a baking sheet. (Parchment paper would work if you don't have a silicone mat.) Sprinkle the raisins and minced onion over the top.
Drizzle olive oil over top, then sprinkle with salt and pepper.
Roast in the preheated oven for 8 to 10 minutes, or until broccoli turns brighter green (but don't let the raisins brown too much.) I suggest checking it after 8 minutes, or gently tossing if you notice the raisins on the edge getting brown.
Remove from oven and let cool slightly. Sprinkle chopped peanuts over top just before serving.
Serve Roasted Broccoli with Golden Raisins and Peanuts.