Cook the potatoes (see note below for air fryer directions) and set aside.
In a pot or large skillet on medium heat, heat the olive oil and add the onions. Saute the onions until just translucent, about 3 minutes.
Stir in the bell peppers and cook for 3-4 minutes more until peppers are starting to change color.
Add the garlic and cook until fragrant, about 1 minute more.
Add the ground beef and cook, stirring and breaking it all up, until all the pink color is gone.
Stir in the remaining ingredients and simmer for at least 10 minutes. Taste to see if it needs a little more salt or vinegar. Remember that the potatoes aren't salted so you can make the mixture just a bit saltier than you might otherwise.
Cut the cooked potatoes almost in half and press gently open. Spoon the Sloppy Joe filling on top of each open potato. OPTIONAL GARNISHES: Top with cheese, if desired, and a dollop of yogurt (or sour cream) - dairy or non-dairy. Garnish with sliced green onions and parsley.