Heat a large skillet over medium high heat. Add olive oil, and the beef, sprinkling with salt and garlic powder. Break into small pieces and cook until browned, about 5 minutes. Drain any excess fat if desired. Remove from the heat and set aside.
Spray a high-sided 9x13 baking dish with olive oil spray. Add the tortellini, half the marinara (about 1 ½ cups) and ¼ cup water, tossing so that the tortellini is equally covered in sauce, then spread into an even layer.
Sprinkle over the spinach in a layer, then carefully add the cooked beef in another layer.
Evenly spread over the remaining marinara (about 1 ½ cups), then sprinkle evenly with cheese.
Cover tightly with foil. Bake for 30-40 minutes covered or until browned, bubbling, and the tortellini is cooked to your liking. Optional, uncover and bake or broil for 5 minutes until browned on top.
Notes
I tested this recipe using 2 (10-oz) packages of Trader Joe’s fresh cheese tortellini as well as 1 (24-oz) Costco 4-cheese fresh tortellini. The recipe worked with both, so regardless of brand you want somewhere between 20- and 24-oz fresh tortellini, or about 2 heaping cups.
This recipe was tested using fresh tortellini, not dry. If using dry, you’ll need to boil first according to package directions, then prepare as instructed.
In testing I preferred layering the tortellini vs. mixing everything, as I found the tortellini cooked best when covered with sauce on the bottom and covered with other ingredients while baking.