In a medium saucepan, sauté the onions, if using, in olive oil until translucent. Add the mushrooms and continue to sauté until your desired tenderness.
Add the garlic and then turn down the heat.
Add the greens; stir gently and allow to wilt (about 3 minutes)
Set aside for a few moment.
Roll out your pizza crust (if needed or if using)
Place on a pizza stone or a cookie sheet, lightly greased (or sprinkled with 2-3 tablespoons of cornmeal)
Ladle the sauce (if using) onto the dough. Spread out to cover.
Spoon the greens mixture onto the prepared crust.
Add the basil, olives, cheeses, herbs and red pepper flakes (if using)
Bake at 400 degrees F. for 10-12 minutes or until done.
Notes
Alternatively: Go for the total outdoors experience and BBQ your pizzas!