Preheat oven to 375 degrees Fahrenheit. Separate the crescent rolls and spread them on a large baking sheet greased with cooking spray. You want to arrange them like the picture, in a large circle with corners overlapping and smaller ends pointing out.
Spread as much pesto as you want on the circle with a spoon. Then the spinach and the tomatoes. I usually buy frozen chopped spinach and thaw it in the microwave for a minute.
Next, sprinkle the feta crumbles all over the circle. Then you will put a little mozzarella on each triangle before you fold it over the filling. Give it a little squish in the middle so it's closed completely and if there's extra dough fold it back a little like I did in the picture.
Once the ring is all closed up, bake in the oven for 20 minutes or until the dough is browned and slightly crispy. Slice into pieces and enjoy!