In a large skillet over medium-high heat, add ground beef and cook, breaking it up with a spatula, until no longer pink, about 7-8 minutes. Drain any excess fat.
Add taco seasoning and water or bone broth to the skillet. Stir to combine and simmer for 5 minutes, until the sauce thickens. Remove from heat and let cool slightly.
Cook rice according to package directions. Let cool slightly before assembling.
While the meat and rice cook, prep your toppings: dice the lettuce, chop the green onions, and any optional toppings you'd like.
To assemble each meal prep container, start with the dressing layer at the bottom: add 1/4 cup Greek yogurt and 1/4 cup salsa.
Next, layer 1/2 cup taco meat and 1/2 cup cooked rice on top of the dressing. Sprinkle 1/4 cup shredded cheese over the warm layers.
Add a generous portion of diced lettuce, a handful of spinach, and diced green onions.
Seal containers and refrigerate for up to 4 days. When ready to eat, pour into a bowl and toss everything together.