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In a large bowl, combine the onion, garlic, parsley, breadcrumbs, Parmesan, eggs, milk, red pepper, flakes, oregano, Italian seasoning, salt and pepper. Stir to combine thoroughly before adding the meat.
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Then add the meat to the breadcrumb mixture.
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Form the meatballs, using the size of your dinner rolls as a guide. I made mine a little bigger than a golf ball.
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Broil the meatballs at 400 degrees for 15-20 minutes, until they're golden brown, flipping them once during cooking.
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While the meatballs cook, heat up the marinara sauce in a saucepan on medium heat.
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After the meatballs are browned, remove them from the oven and place them into the hot marinara sauce.
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Lower the heat and simmer the meatballs for another 15 minutes.
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Toast the slider buns until they're slightly golden, then place the bun bottoms onto a baking sheet.
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Place a meatball onto each bun, and top each meatball with a generous sprinkle of mozzarella cheese.
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Broil the meatballs at 400 degrees F for 3-5 minutes, just until the cheese is melted.
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Place a bun top onto each slider, then serve.