Step 1

Preheat an oven to 350º F.

Step 2

Mix the dry dough ingredients together in a large bowl before cutting the butter in with a fork (until slightly crumbly). Add the Greek yogurt and mix until a dough begins to form. Don't over mix. There should be some remaining flour in the bowl.

Step 3

Empty the dough and remaining dry ingredients onto a flat surface. Use your hands to work everything together until no crumbs remain. Set aside.

Step 4

Mix the granulated sugar and cinnamon together in a separate bowl. Divide the dough into small pieces (I did 15, but you could make them smaller/larger.) Toss a few at a time in the cinnamon sugar to coat.

Step 5

Fill the bottom of a 6.5" cast iron skillet or similar sized baking dish with the dough pieces. Sprinkle some of the crushed walnuts on top and place another layer of the dough pieces on top with more walnuts. Sprinkle any remaining cinnamon sugar over the top.

Step 6

Microwave the butter for 10-15 seconds before stirring in the brown sugar. Stir and pour over the top in an even layer.

Step 7

Bake for 30-35 minutes or until the the dough pieces have risen and the bottom layer is cooked through. Different dishes or different sized dough pieces may affect bake time.