Step 1: Preheat your oven to 350°F (175°C).
Step 2: In a large mixing bowl, whisk together the eggs, cottage cheese or Greek yogurt, maple syrup, and vanilla extract until smooth.
Step 3: In another bowl, mix the almond flour, gluten-free flour, baking powder, and sea salt until evenly distributed.
Step 4: Gradually add the dry mixture to the wet mixture, folding gently until just combined.
Step 5: In a small bowl, prepare the cinnamon filling by combining the melted butter, coconut sugar, pinch of sea salt, and ground cinnamon.
Step 6: Pour half of the batter into a greased loaf pan, sprinkle with half of the cinnamon filling and walnuts, then top with remaining batter and filling.
Step 7: Bake for 45-50 minutes, or until a toothpick comes out clean.
Step 8: Allow to cool for 10 minutes in the pan before transferring to a wire rack to cool completely.