Gather all ingredients before starting recipe.
Heat half of the oil in a medium sized frying pan over medium heat. Add peeled and sliced Spanish onion, thyme, black pepper, a pinch of sugar and fry over medium high heat for about 15 minutes, or until the onions turn a golden color. Stir frequently to prevent the onions from burning,
Heat the remainder of the oil in the same frying pan and return to medium high heat, add the mushrooms and cook until the mushrooms start to brown, 4-5 minutes.
Spread the cooled béchamel on the naan or flat bread and then spread the caramelized onions on top of the béchamel
sauce. Top the onions with the sautéed mushrooms.
Pre-heat oven to 375º
Place the prepared pizza on a rack over an aluminum foil lined sheet pan and bake for 15 minutes.
Allow to cool for a minute or 2, then slice and serve.