1-First, preheat your oven to 350°F (175°C) and prepare your pan by greasing and lining a 9-inch springform pan. This step prevents sticking and promotes even baking, a tip that helps working professionals save time.

2-In a medium bowl, whisk together the dry ingredients like flour, baking powder, baking soda, and salt to build a strong base for your cake.

3-In a large bowl, cream the butter and sugar until light and fluffy, which incorporates air for a better rise. Add the egg, vanilla extract, and optional almond extract, then mix in the sour cream until smooth. This creates a creamy batter that holds everything together nicely.

4-Gently fold in half of the blueberries tossed with lemon zest and cornstarch to the batter. Pour the mixture into your prepared pan, then top with the remaining blueberries and the chilled brown sugar crumble for that irresistible topping.

5-Bake for 45-50 minutes, checking with a toothpick for doneness. Let it cool for about an hour before adding the optional lemon icing, which is made by whisking powdered sugar with milk and lemon juice. Slice and serve for a treat that’s perfect for party hosts or seniors looking for a comforting snack.