In a skillet over medium heat, cook the oil, meat, onion, garlic powder and salt for about 5-7 minutes, until cooked through. Drain excess fat.
Pour one jar of pasta sauce and 1 cup of water in the bottom of the slow cooker.
Break the spaghetti noodles in half and place them on top of the sauce.
Add the cooked meat on top of the noodles, sprinkle with the cheese, and cover with the second jar of pasta sauce.
Cover the crock pot and cook on high for 2 to 2 1/2 hours or low for 6 hours. (See notes)
Remove the lid, stir to combine and mix everything together.
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Notes
Keep in mind that each slow cooker operates at various temperatures and cooking times. To avoid overcooked spaghetti, test it regularly to ensure it's cooked to your liking. Overcooked pasta can become sticky and mushy, which nobody likes!