We could say that good old-fashioned Spinach Squares are staging a comeback, but they never actually went away. Also called “spinach brownies,”—no, there’s no chocolate—these squares bring to the savory portion of a meal what fudgy brownies bring to dessert. Cheesy-rich and luscious, they invite you to have just one—and then one more. Stir these up in minutes as an easy alternative to Spanakopita (Greek Spinach Pie). An appetizer, snack, side dish or even main attraction, Spinach Squares freeze and reheat well. The recipe makes a big batch, so you can serve some and still have enough for another occasion. And they make great finger food, even sneaked cold from the fridge. Surprisingly, Spinach…