First Grab out your cast iron skillet and heat over medium high heat. Add in the ground beef and diced jalapeƱo if using. Cook until browned. If it's greasy, drain and return to the heat.
Next add in the taco seasoning, salsa, tomato sauce, and water. Give everything a stir to combine and bring the mixture to a simmer.
Break your spaghetti noodles in half and add to the pan. Use a piece of foil or pan cover to cover and simmer for about 20 minutes. (stir halfway)
After the 20 minutes and the noodles are tender, top with shredded cheese and cover to let melt a bit.
Then top garnishes/toppings of choice. I highly recommend hot sauce.