01 - Preheat oven to 350°F. Grease a bundt pan or deep round baking dish thoroughly with cooking spray or butter.
02 - Combine almond flour, protein powder, baking powder, and salt in a large bowl. Whisk to distribute evenly.
03 - Whisk Greek yogurt, eggs, almond milk, melted coconut oil, and vanilla extract in a separate bowl until completely smooth.
04 - Pour wet ingredients into dry ingredients. Stir with a spatula until a soft, cohesive dough forms.
05 - Combine erythritol sweetener and ground cinnamon in a small bowl. Mix thoroughly to blend.
06 - Pinch off approximately 1-inch pieces of dough and roll into balls. Dip each ball in melted butter or coconut oil, then coat completely in cinnamon mixture.
07 - Layer coated dough balls in prepared pan, distributing evenly and leaving slight space for expansion during baking.
08 - Bake for 25-30 minutes until golden brown on top and set in the center. A toothpick inserted should come out clean.
09 - Let the bread cool in the pan for 10 minutes to set before removing or glazing.
10 - Whisk together Greek yogurt, powdered erythritol, and vanilla extract until smooth. Drizzle over warm bread just before serving.