Cook the fusilli according to the packet instructions. Drain the pasta into a colander, reserving 1/2 cup of the cooking water. Set aside

As the pasta cooks, pour the olive oil into a large fry pan and place over a medium heat. Once hot, add the onion and saute for 2-3 minutes or until the onion begins to soften

Add the bacon, zucchini, mushroom and garlic, and continue to fry for 4-5 minutes or until the bacon and onion start to turn golden

Reduce the heat to low, and then add the pasta to the fry pan and stir through to combine. Add the ricotta, reserved hot pasta water, parmesan and parsley

Season with salt and pepper, and gently stir all ingredients together to coat the pasta

Serve immediately