Step 1: Preheat your oven to 350°F (175°C). Grease and flour a 9-inch round cake pan or line it with parchment paper.
Step 2: In a medium bowl, combine the chopped dates, boiling water, and baking soda. Stir well and let it sit for 10-15 minutes. The baking soda will help break down the dates and create a smoother texture.
Step 3: In a large mixing bowl, cream together the softened butter and brown sugar until light and fluffy, about 2-3 minutes, using an electric mixer.
Step 4: Beat in the eggs one at a time, ensuring each is fully incorporated before adding the next. Scrape down the sides of the bowl as needed.
Step 5: In a separate bowl, whisk together the all-purpose flour, baking powder, salt, cinnamon, and nutmeg.
Step 6: Gradually add the dry ingredients to the wet ingredients, mixing on low speed until just combined. Do not overmix.
Step 7: Gently fold in the date mixture (including the liquid) and the chopped walnuts until evenly distributed.
Step 8: Pour the batter into the prepared cake pan and spread evenly.
Step 9: Bake for 50-60 minutes, or until a wooden skewer inserted into the center comes out clean. The top should be golden brown and spring back when lightly touched.
Step 10: Remove the cake from the oven and let it cool in the pan for 10-15 minutes before invertying it onto a wire rack to cool completely.
Step 11: Once cooled, dust with powdered sugar or spread with cream cheese frosting if desired. Slice and serve your delicious date and walnut cake.