Boil a large pot of salted water, add ½ the box of pasta + cook 10-12 min or until al dente, then drain + return to pot

Meanwhile, heat 1 tbsp oil in large skillet over med-high; sauté half the spinach + salt/pep, 1-2 min until wilted; add remaining spinach + cook 1-2 min more until all spinach is wilted

In a small pot or skillet, warm ½ cup sauce + 2-4 slices of cheese; let sit until cheese is melted + hot, then stir to combine, about 3 min

Add cheese sauce + spinach to pasta; divide between bowls—enjoy!