Preheat an oven to 325 degrees and line a sheet tray with parchment paper. In a bowl, combine diced spinach, ricotta cheese, salt, pepper, and basil. Set this aside.
Step 2
Lay 4 slices of mozzarella cheese on your sheet tray. Set the tray in the oven and let the cheese melt for about 4 minutes. This is just long enough for the cheese to become pliable without turning into a mess.
Step 3
Divide your mixture evenly on the 4 mozzarella squares, making each portion slightly off-center near a corner. Use a spatula to help you pick up the cheese corner farthest from the filling and fold it over to create a triangle-shaped pocket. Fold the wide corners of the triangle in the help seal the pockets. If the cheese is too gooey to handle, let it sit for 30 seconds at a time before trying to lift it up again.
Step 4
Return the tray to the oven for 10-15 minutes, checking frequently. Bake until the edges and tops of the pockets turn golden brown and crisp. You may cook longer for a completely crispy pocket, but make sure your ricotta filling doesn’t ooze out.
Step 5
Let the pockets cool for about 5 minutes and enjoy!