Cook the pasta according to the package.
Add 1 TBSP oil to a skillet over medium heat, followed by the ground beef with salt and pepper. Brown the beef by stirring it frequently for about 7 minutes, until it's no longer pink.
Add the entire can of crushed tomatoes and Italian seasoning. Here, add 1-2 tsp of any other spices: sage, thyme, oregano, basil etc. If you're adding in additional veggies such as zucchini or broccoli, add them now.
Mix the milk and melted butter in a bowl or measuring glass. This creates a nice heavy cream substitute. On medium heat, pour in the milk to the tomato beef mixture. Stir to combine. Taste the mixture and adjust seasonings as needed. Let the mixture cook for about 10 minutes.
Add in the cooked pasta and chopped swiss chard (or other greens). Stir until the greens melt and the pasta is covered in sauce. Stir in the parmesan cheese last.
Assemble: Divide the mixture between three meal prep containers. Add more parmesan cheese on top if desired!