The topping is precooked in the following manner:
Heat oil over medium-high heat in large skillet. Add chicken and bacon pieces, stir-fry for a few minutes. Add onions, garlic, red pepper, mushrooms.
Cook, stirring for three minutes longer, until onions are tender and translucent. Drain off excess liquid.
Spread cheese over pizza shells, and top both with chicken mixture, rosemary leaves and seasonings.
Sprinkle lightly with Parmesan cheese before baking.
Bake each pizza at 425°F or 220°C for 10 - 12 minutes until crust and topping is golden-brown.