Over medium heat, cook sliced onion until softened and lightly caramelized. Add garlic and cook until fragrant.
Add full jar of pasta + 2 cups of water (I put the water in the jar first to get the any residual pasta sauce in the jar). You may need to lower the heat slightly at this point. Add dried pasta and stir to coat.
Add oregano, parsley, and salt and stir to incorporate, then cook for about 5-10 minutes, depending on your stove (I cooked for 10 minutes on my electric stove, maybe 5 minutes on my gas stove). Stir occasionally to prevent burning on the bottom.
Once noodles are cooked al dente, stir in baby spinach and add vegan beef crumbles (the kind I have don't need to be cooked, just heated through).
Stir in vegan cheese and nutritional yeast, and serve!