Preheat oven to 400°F. Line 2 sheet pans with parchment paper.
Prepare Butter Pizza Crust. Divide dough into 8 equal pieces and roll out into thin circle about 6 inches wide. Transfer to sheet pans.
In large skillet set over medium high heat, brown sausage. Transfer to paper towel lined plate to drain. Drain all but 1 tablespoon of sausage grease from pan. Return pan to heat, add sliced mushrooms, olives and garlic, and season with salt and pepper. Cook until mushrooms are browned. Remove from heat and let cool to room temperature.
In bowl, combine sausage, mushrooms, herbs, mozzarella and parmesan. Spoon about ½ cup of mixture into center of each pizza dough round.
Fold dough over to make half-moon shape. Crimp edges to seal. Brush with egg wash and bake until golden, 25-30 minutes. Serve with marinara sauce, for dipping.