Preheat your oven to 400ºF. Wilt the spinach in a nonstick pan with nothing else in it until softened. Place in a sieve or colander and press with a paper towel until the water has been squeezed out.
Chop the wilted spinach and add to a bowl with the feta, salt, pepper, lemon zest, garlic, and ricotta cheese. Set aside.
Lay out one sheet of phyllo pastry and brush with olive oil. Place another sheet on top and continue layering until you have four sheets.
Cut four rectangles, so that they are 3" x 8". Place a heaping tablespoon of filling at one end, then fold. Find detailed instructions, pictures, and a video above.
Bake the spanakopita in your oven for 20-25 minutes. Enjoy!