01 - Preheat oven to 350°F. Grease a bundt pan or deep round baking dish thoroughly with cooking spray or additional butter.
02 - In a large bowl, combine almond flour, protein powder, baking powder, and salt. Whisk together until evenly blended.
03 - In a separate bowl, whisk Greek yogurt, eggs, almond milk, melted coconut oil, and vanilla extract until smooth and creamy.
04 - Pour wet ingredients into dry ingredients. Stir with a spatula until a soft, cohesive dough forms. Do not overmix.
05 - In a small bowl, mix erythritol and cinnamon until thoroughly combined.
06 - Pinch off small pieces of dough, approximately 1 inch in diameter. Roll each piece between your palms to form smooth balls.
07 - Dip each dough ball into melted butter or coconut oil, then roll generously in the cinnamon-sweetener mixture until fully coated.
08 - Arrange coated dough balls in the prepared pan, stacking them in layers. Leave some space between pieces for expansion during baking.
09 - Bake for 25-30 minutes, or until golden brown on top and firm to the touch. A toothpick inserted should come out clean.
10 - Let cool in the pan for 10 minutes. If using the glaze, whisk Greek yogurt, powdered erythritol, and vanilla until smooth, then drizzle over warm bread before serving.