Logic, I roast my broccoli with olive oil, jarred minced garlic and salt and pepper. Cut all the flowerettes off in bite size pieces, any size you want. If you like the stems cut those up too. Get a cookie sheet or 9x13 inch baking dish and put the cut up broccoli in it, spread it about. Drizzle quit a bit of olive oil over the broccoli, so that there is obvious oil on the bottom of the pan. Throw in a couple to good tablespoons of minced garlic or more if you want, plenty of salt and pepper. Get your hands in there and toss the garlic and spices real good, then spread it out again. Bake at 400 for about 20 minutes. Then if you want that grilled or charred effect, turn on the broiler and get them a bit blackened on the tops. That what I do cause I like food a little burnt.
And just so you know, I do all of my veges this way.