Place warm water and drained chopped spinach in the food processor. Blend until smooth. Set aside. See NOTE 1.
Combine 1 cup of bread flour, instant yeast, sugar, garlic powder, and salt in a large bowl.
Add olive oil and the spinach mixture and use a spatula to stir well.
Gradually add another 1 cup of flour. Add any additional flour as needed. Stir until the dough is forming into an elastic ball and is beginning to pull away from the sides of the bowl. The dough will still be slightly sticky but should not be so runny that it coats the spatula.
Coat the dough ball and the inside of the bowl with some olive oil, then cover the bowl tightly with plastic wrap and place it in a warm place (about 90ºF/32ºC).
Allow dough to rise for 30 minutes or until doubled in size.
Once the dough has risen, gently punch the dough to deflate it. Then transfer it to a lightly floured surface and knead briefly by hand until smooth.
Preheat oven to 400ºF/200ºC.
Use either your hands or a rolling pin to work the dough into a 12″ x 13” rectangle.
Spread your spinach stuffing out on half of the dough. Then, take the other half and fold it over the top of the spinach stuffing, pinching the seams to enclose the stuffing.
Cut the rectangle into three even strips. Then, braid the strips and enclose them together into a circle, pinching the seams where the two ends meet. If you are not sure how to braid, check out NOTE 2.
Transfer the bread to a baking sheet lined with parchment paper. Baste it with melted butter and sprinkle it with grated parmesan cheese.
Bake in preheated oven for 20-25 minutes, until the top turns golden brown. Enjoy!