Begin by heating a large skillet over medium heat, adding the ground beef to brown and crumble it until fully cooked. Stir in the diced onions and chopped garlic, sautéing until the onions become translucent, which should take about five minutes. Remember to drain any excess grease before moving on to the next step.

Stir in kosher salt, marinara sauce, and water into the skillet with the meat mixture. Increase the heat to medium-high until it reaches a gentle boil, allowing all flavors to meld beautifully.

Once boiling, reduce the heat to low and add broken pieces of lasagna noodles directly into the sauce mixture. Cover with a lid and let it simmer for approximately ten minutes, allowing the noodles to cook thoroughly.

After ten minutes, remove the lid and give everything a good stir while scraping up any bits stuck to the bottom of the pan. If it appears too dry, add an extra quarter to half cup of water as needed before nestling in cottage cheese throughout.

Sprinkle shredded mozzarella cheese over the top of your lasagna mixture before covering once more with the lid. Let it simmer for another ten to twelve minutes until noodles are tender and cheese has melted beautifully.

Remove from heat once done and allow it to sit uncovered for five to ten minutes before serving hot. Enjoy your homemade skillet lasagna that's ready in just thirty minutes!