Make broccoli rice. Add the broccoli florets to a food processor and pulse a few times to create broccoli rice. Alternative, you can cut the broccoli into a small dice with a knife. Heat the broth. In a medium saucepan over low heat, bring the broth to a simmer.
Saute the aromatics. Heat the oil in a separate large pan over medium heat. Add the onion and saute for 4 to 5 minutes, until softened. Add the garlic and ½ teaspoon salt, and saute another 30 seconds.
Add the rice. Add the rice and stir for another minute, until lightly toasted.
Add the liquids and broccoli rice. Add the white wine to deglaze the pan, and stir constantly until all of the liquid has absorbed, about 2 to 3 minutes. Add 1 cup of heated broth and simmer until it's absorbed, stirring constantly for about 3 to 4 minutes. Continue adding the broth, a cup at a time, simmering until fully absorbed before adding more. Stir constantly throughout this process, which takes about 15 to 20 minutes. Then, add the broccoli to the risotto when you add the last cup of broth, stirring it for 3 to 4 minutes.
Add parmesan. Remove the risotto from the heat. Add the parmesan, parsley, butter, remaining ½ teaspoon salt, and pepper to the risotto. Stir together to combine.
Serve. Serve the risotto while warm, and if you'd like, garnish with extra parmesan and parsley.