Place the sliced mushrooms and shallots in a medium-sized bowl. Add
the olive oil, marjoram, and salt & pepper to taste. Toss to coat
well and set aside.
Punch the dough down. On a lightly floured work surface, roll out or
stretch the dough into a circle or rectangle. Lightly oil a pizza pan
or baking sheet and place the dough on it, stretching it to fit.
Press the mushroom mixture into the top, keeping the mushroom slices
in a single layer. Bake on the bottom oven rack until the crust is
golden brown, about 30 minutes. Serve warm or at room temperature.