Toss halved Brussels sprouts with about 2 tbs of olive oil
Place sprouts on cookie sheet
Sprinkle with an all purpose seasoning
Place in oven 25-40 minutes, or until fork inserted into stem penetrates easily (cooking times can vary widely for these – checking for doneness will be your best guide)
About 15 minutes before the Brussels sprouts are done, place onions in a saucepan over medium heat, and saute onions until translucent
Add chorizo to the saucepan's ingredients, and cook until browned, drain fat
Transfer cooked Brussels sprouts to the saucepan and mix together with the chorizo and onions