In a large Dutch oven or heavy bottom bot, heat olive oil over medium heat, add the onion, and cook until slightly soft
Add the ground beef, and cook until no longer pink. Drain beef if necessary, then add Italian seasoning blend, sea salt, garlic powder, black pepper, red pepper flakes (optional), and stir
Add the spaghetti noodles, marinara sauce, diced tomatoes and water, and stir well, pushing the noodles under the liquid and separating them so they don't stick
Cover, and bring to low boil over medium high heat, then remove cover, and stir frequently to make sure pasta doesn't stick and noodles aren't clumping together. Reduce heat to medium, if necessary
When pasta is al dente or done to your liking, remove from heat, add some grated Parmesan cheese and chopped parsley, if desired, and enjoy!