Heat butter in a cast iron skillet over medium high heat. Add in diced onions and cook until browned, about 2-3 minutes. Add in baby bella mushrooms and cook for 3 more minutes.
Pour in chicken stock and bring to a boil. Add in RightRice Creamy Cracked Pepper Risotto and allow to boil for 5 minutes, stirring occasionally.
Remove skillet from heat and add in peas and parmesan cheese. Stir to combine, cover, and let sit for 5 minutes.
Open lid and add in lemon juice, stir to combine and serve immediately topped with chopped parsley, lemon zest and extra parmesan cheese.