Add the frozen fully cooked meatballs to a large skillet or pot (I like nonstick) and heat according to the package directions until hot all the way through.
Pour approximately 1/2 jar of barbecue sauce over the warmed meatballs. Stir until evenly coated, then cook for another 2–3 minutes over medium-low heat until the sauce is warm and slightly thickened.
In a separate saucepan, prepare the mashed potatoes according to the package directions.
Add approximately 1/2 package of riced cauliflower to the mashed potatoes. Stir together over medium heat until the cauliflower is completely heated through and the mixture is creamy. If the cauliflower releases extra moisture, continue cooking for another minute or two.
Microwave the steam-in-bag peas according to the package directions.
Divide the mashed potato and cauliflower mixture among plates. Add the BBQ meatballs and peas, spooning extra barbecue sauce over the meatballs if desired.
Serve warm and enjoy.