Preheat your oven to 350°F (180°C). Grease and flour a cake pan, or line it with parchment paper.
In a medium bowl, whisk together the flour, baking powder, and cinnamon. This ensures the dry ingredients are evenly distributed in the batter.
In a separate bowl, cream together the butter and sugar until light and fluffy.
Add the eggs one at a time to the butter-sugar mixture, mixing well after each addition.
Gradually add the dry ingredients to the wet ingredients, then pour in the milk. Mix until just combined, ensuring the batter is smooth.
Pour the batter into the prepared cake pan and bake for 30-35 minutes, or until a wooden skewer inserted into the center comes out clean.
While the cake is baking, prepare the walnut cream: whip the heavy cream until stiff peaks form. Gently fold in the powdered sugar, honey, and ground walnuts.
Let the cake cool completely, then slice it in half horizontally and spread the walnut cream filling evenly. You can also spread a thin layer on top of the cake.
Garnish with extra ground walnuts or a sprinkle of cinnamon, if desired. Refrigerate for 1-2 hours to allow the flavors to meld.
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