Preheat your oven to 350 degrees F. Line a 9" x 5" loaf pan with parchment paper or spray it with cooking oil.

Add the ingredients for the apple cinnamon mixture to a small mixing bowl. Stir well, and set aside.

In a stand mixer or a mixing bowl, cream together the butter, coconut sugar, and vanilla extract (wet mixture).

Add the eggs one at a time and continue mixing until well combined.

In a separate mixing bowl, stir together the gluten-free flour, baking powder, and salt (the dry ingredients).

Pour the flour mixture into the bowl with the wet mixture and mix just until combined.

Add the Greek yogurt and mix until a smooth and well combined. The mixture will be very thick and doughy - this is normal.

Spread half of the bread dough in the prepared loaf pan.

Add 2/3 of the apple cinnamon mixture and press it into the dough with a spoon.

Spread the remaining bread dough on top, followed by the remaining apple cinnamon mixture.

Place on the center wrack in the oven and bake for 50 minutes. Turn the oven off and allow the bread to sit in the oven an additional 5 minutes or until it tests clean.

Remove bread from the oven and allow it to cool for at least 20 minutes before slicing and serving.

Serve warm with butter!