Add your bread crumbs, minced garlic, BBQ rub, and egg to a large mixing bowl. Mix together until and then let stand for 5 minute.
Then add the ground pork and ground beef and mix thoroughly. Add another egg if the meatballs are too dry and more bread crumbs if too wet.
Next, form the ground meat into 3-4 oz meatballs.
Place all the meatballs into the fridge to set for 30 minutes. Preheat your smoker to 300°F which is a medium-low heat.
Heat the griddle to about 400-425°F. Place the meatballs down and allow them to start cooking for about 60-90 seconds.
Then, flip the balls over to the other side. Use your spatula to gently press down on each meatball to flatten them out.
You want the meatballs to be about 1/3" to 1/2" thick. Don't press the meatballs to thin as they may start to crumble.
Let the meatballs to cook on the first side for about 4-5 minutes, when you start to see a crust on the meatballs you can flip then and cook until they reach an internal temperature of at least 160°F.
Start by toasting the slider buns in butter until they're lightly golden. Then, remove them from the heat.
While the meatball patties are cooking, place smaller slices of cheese on top of them and let the cheese melt. Once it's melted, take the cooked meatballs off the heat.
Next, assemble the meatball sliders. Spread some warm marinara sauce on both the top and bottom of the toasted buns, and add a sprinkle of chopped basil for garnish.
Finally, place the cooked meatballs between the buns, and serve your delicious sliders while they're still warm!