Start by halving your bell peppers, removing the seeds and membranes (white ribs).
Get your large skillet nice and hot over medium heat. Throw in your ground beef, diced onion, and garlic.
Cook until your meat is browned and no pink remains. Break it up into smaller pieces and drain any fat.
Now, add in your cooked rice and shredded cabbage. Mix it all up until it's well combined and heated through.
Time to stir in your marinara sauce, Italiano seasoning, salt, and pepper. Give that a good mix and let it heat up for a minute or two before taking it off the heat.
Preheat your smoker to 325 degrees F.
Now the fun part! Spoon your ground beef mixture into the halved peppers and top each one with your shredded cheese.
Line a rimmed baking sheet with parchment paper and place your stuffed peppers on it. This'll catch any cheese that tries to escape.
Place the baking sheet with your stuffed peppers directly onto the grill grate of your preheated smoker. Close the lid and let them smoke for 30 minutes. You're looking for the peppers to be heated through and the cheese to be bubbling and golden. If the peppers are tender and easily pierced with a fork, they're done!
Serve up these beauties and enjoy the smoky, hearty flavor!