Heat a drizzle of olive oil in a skillet over medium heat. Add the onion, garlic, celery, and beef. Sauté for 5–8 minutes until it’s browned.
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Add the cooked meat into the Crock Pot along with the oregano, thyme, ziti, crushed tomato, beef stock, and a pinch of salt and pepper.
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In a bowl, mix the egg with the shredded mozzarella, ricotta, and a pinch of salt and pepper.
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Spread the ricotta mix over the meat and ziti mix. Set the Crock Pot on HIGH for 1.5–2 hours or until the pasta is cooked and the cheese oozes.
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