Prepare the meatballs as in Steps 1-3 in the “Prep Ahead” section.
Add the vegetable oil to a large saute pan over medium heat.
Add the meatballs, turning as they brown. You may have to work in batches. Place the meatballs aside on a plate or tray as they cook.
Once the meatballs have been cooked, add the snow peas and mushrooms and cook until the mushrooms have started to soften, about 2-3 minutes.
Mix the sauce ingredients together in a bowl and add to the pan.
Cook on high until the sauce has started to simmer, then turn the heat to low.
Let the sauce cook, stirring occasionally, until it has thickedn enough that it coats the back of a spoon.
Add the meatballs back to the sauce and gently toss so they are covered.
Cook until the meatballs are warmed through, then remove the pan from heat.
Serve meatballs over rice with the veggies and sauce spooned on top.