Prepare the Oven and Pan: Preheat the oven to 350°F (175°C). Lightly grease a 9-inch round cake pan and line the bottom with parchment paper.
Combine the Dry Ingredients: In a medium bowl, whisk together the flour, baking powder, baking soda, salt, and cinnamon until evenly combined.
Mix the Wet Ingredients: In a separate large bowl, whisk together the melted butter, honey, sugar, eggs, milk, and vanilla extract until smooth.
Make the Batter: Gradually add the dry ingredients to the wet ingredients. Stir gently with a spatula until just combined. Do not overmix.
Fill the Cake Pan: Pour the batter into the prepared cake pan. Use a spatula to spread the batter evenly and smooth the top.
Bake the Cake: Bake for 32–35 minutes, or until the cake is golden brown and a toothpick inserted into the center comes out clean or with a few moist crumbs.
Cool the Cake: Allow the cake to cool in the pan for about 10 minutes. Transfer it to a wire rack and let it cool completely before slicing.
Decorate and Serve:: Dust the cooled cake with powdered sugar and drizzle with a little honey if desired. Slice and serve.