A matter of taste
Olive oil. Garlic powder. Good seasoning (I prefer Lawry's seasoned salt, or Greek seasoning) applied very liberally.
Into the oven at 375 (with convection) or 425 without for 30-45 minutes depending on how much broccoli you've crammed onto your baking sheet. I never have leftovers - no matter how much broccoli is on the pan. The kids, the spouse, all of them always start looking around for whether or not there's seconds available before they even get through their firsts.
Also does wonders for cabbage, green beans, and brussels sprouts.
I hate and loathe raw broccoli with a passion. Just typing that, I can taste that lingering bitterness on the back of my tongue, thanks to years of my mother slipping it into salads and forcing me to eat it (when I couldn't manage to sneak it to the dog). It's okay stir-fried, now, but it's best roasted to a salty, crunchy crisp.