Preheat oven to 350 °Grease 9x5 loaf pan or line with parchment paper.
Mix 1 tablespoon Pyure all-purpose sweetener with 1 teaspoon cinnamon in small bowl. Set aside.
In medium bowl, mix together dry ingredients (almond flour, coconut flour, xanthan gum, salt, stevia, erythritol, baking powder, and cinnamon). Set aside.
Add butter, coconut oil, eggs, and vanilla extract into a food processor. Process until well blended. Add dry ingredients and process until uniform batter is formed.
Remove ½ cup batter and mix into the cinnamon/sweetener mix. Set aside
Place half batter into the prepared loaf pan and spread out evenly.
Spoon half of cinnamon mixture over the batter.
Pour remaining batter over cinnamon mixture and spread out evenly.
Spread remaining cinnamon mixture on top and swirl in using a knife.
1Bake at 350F for 40 minutes, then reduce temperature to 325F.
1If top is becoming too brown, lightly cover with foil tent. Bake 15 minutes more.
1If still soft in the center, let sit in oven 5-10 minutes until toothpick inserted comes out dry.