Bacon Mushroom Risotto with Caramelized Onions

thick bacon, cut into a large dice

button mushrooms, sliced

olive oil, divided

large yellow onions, peeled, cut in half and sliced thinly

dry white wine

chicken broth, I use Pacific brand

garlic, minced

arborio rice

chopped thyme

grated Parmesan, plus more to serve, if desired

Salt and freshly ground black pepper, if desired