This Spinach Soufflé has the same creamy, airy texture as Stouffer’s, but homemade is always better, right guys?!The secret is squeezing out as much liquid as possible from the spinach. Too much moisture makes the soufflé heavy instead of airy.A butter-and-flour roux thickens the base just right, giving it a smooth, rich texture. The cheese melts in evenly when added gradually.Separating and whipping the egg whites makes a huge difference. It’s what gives the soufflé its light, fluffy structure.