To prepare the filling, heat olive oil in a large skillet. Add kale, salt, garlic powder and pepper (if using) and cook over medium heat for about 5 minutes. Set aside
In a large bowl combine cream cheese, shreds and oregano and mix well. Add cooked kale and mix until well incorporated. Set aside
To prepare the dough, combine flour, salt, baking powder and cream cheese in the food processor. Pulse about 10 times until combined
Add olive oil and water and continue pulsing 10 to 15 more times, making sure to scrape the sides so all the ingredients are well incorporated
Transfer mixture to a floured surface and and work it with your hands to form a dough
Roll out the dough onto an approximately ⅛ inch thick disk. Using a round 3.5 inch cookie cutter, cut out as many circles as you can. Gather the extra dough, reroll it and cut out more circles. Repeat the process until you've used pretty much all the dough (you'll have about 12 dough circles total)