Slice all the vegetables (including the garlic) to about 1/8th inch thick - I used the thickest setting on my mandolin for this.
Grease a shallow ovenproof pan with oil and place the garlic slices on the bottom.
Sprinkle on half of the thyme or basil.
Arrange the remaining sliced vegetables in an attractive pattern - concentric circles for round pans or parallel lines for square or rectangular pans.
Sprinkle with remaining thyme or basil and a drizzle of oil.
Cover with foil and bake at 400 for 30 minutes.
Uncover and bake for a further 10-15 minutes.
Serve hot or cold.