In a large saucepan, bring a pot of salted water to boil (if you cover the pot, it will boil faster) and cook your macaroni noodles until soft.
Meanwhile, in a large frying pan, add a turn of olive oil and let heat up. Add in your diced onion and minced garlic. Stirring frequently, cook until the onions start to get translucent.
Add in the ground sirloin. Season with garlic salt, oregano, Italian seasoning, and red pepper flakes. Break up the meat and brown until no longer pink.
Add in the two cans of tomato sauce and turn heat to low and let simmer.
By now, the noodles should be cooked. Drain them and return them to the pot.
Pour the sauce into the noodle pan and stir to combine. Add in the sour cream and stir to distribute.
That's it. I let it sit for about 15 minutes to let the flavors come together and let the sauce soak into the noodles.