Preheat Oven & Prep Pan: Preheat the oven to 356ºF (180ºC) fan-forced. Grease a 9-inch round baking pan with butter and line with parchment paper. Note: For non-stick pans, line the base with parchment paper and grease just the sides with butter and dust with flour for smooth cake sides. Set aside.
Prepare Dates: In a large mixing bowl, add chopped dates and cover them with the boiling water. Let them stand for 10 minutes to soften.
Beat Butter With Sugar: In a separate large mixing and using electric hand beaters or a stand mixer with the paddle attached, add softened butter and brown sugar and beat on medium-high speed for 2 minutes, scrape down the sides.
Incorporate Egg: Add egg and oil and beat for 20 seconds to incorporate.
Add Soaked Dates: Pour in the softened dates (with all of the soaking water) and use a spatula to combine.
Incorporate Dry Ingredients: Add the flour, baking powder, baking soda and salt and beat on low speed until incorporated, about 10-15 seconds, ensuring not to over-beat. Use a spatula to incorporate extra flour from the sides of the bowl back into the batter.
Transfer Batter: Pour the batter into the prepared cake pan, smoothing out the top.
Bake: Bake for 45-50 minutes or until a toothpick inserted into the center comes out clean or with a few moist crumbs.
Cool: Allow the cake to cool in the pan for 15 minutes. Then, transfer it to a wire rack to cool completely.
Glaze: Optional, brush some maple syrup over the cooled cake and serve. Enjoy!