I can't find the original recipe, but this is the closest to what we always make. It's the absolute best way to grill zucchini. Brush both sides with olive oil and season with oregano, salt, pepper, and garlic powder.
Garlic Roasted Cabbage Steaks: 1 inch slices rubbed with garlic, oil, salt and peppet on both sides. Bake on a sprayed pan at 30 min. Flip and bake another 30 min until edges brown (Suggestion in FB comments to serve with a bit of vinegar sounded good!)