Begin by Preheating the oven to 350°F.

Sautee the diced onion, mushroom, and garlic in the olive oil over medium heat in a pan. Continue until the onion is translucent and all of it is soft.

Place two pitas, concave side up, next to each other on a cookie sheet. Do the same with the other two pitas on another cookie sheet.

Smear the hummus onto each pita, divided evenly among the four pitas.

Divide the shredded mozzarella evenly among the four pitas, keeping the cheese mound as flat as possible.

Divide the sauteed onion, garlic, and mushroom among the four pitas, carefully placing it on top of the mozzarella, making sure it doesn't tumble off.

Divide the feta cheese among the four pitas, also taking care that it stays in place atop the pile.

Place the cookies sheets in the oven, and let them bake for about 10 minutes. Exposed edges of the pita will start to crisp. the Feta will not melt, but it will get a little dark.

When the baking is done, slip each one onto it's own plate using a spatula or wide knife. Slice each pitza into 8 small slices, then squeeze them back together as if they had not been cut. Garnish with a pinch of paprika on top and three olives. Serve warm.