Creating the Irresistible Raspberry Almond Crumb Cake is simple and enjoyable. Follow these steps to ensure success:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease and flour a 9×13 inch baking pan.
2. Mix Wet Ingredients: In a large bowl, cream together the softened butter and granulated sugar until light and fluffy. Add the eggs, vanilla extract, and almond extract, mixing until fully incorporated.
3. Combine Dry Ingredients: In a separate bowl, whisk together the flour, baking powder, baking soda, and salt.
4. Combine Mixtures: Gradually add the dry mixture to the wet mixture, stirring until just combined. Be careful not to overmix.
5. Add Raspberries: Gently fold in the raspberries until evenly distributed throughout the batter.
6. Prepare Crumb Topping: In another bowl, combine the flour, sugar, and cinnamon (if using). Pour in the melted butter and mix until crumbs form.
7. Assemble the Cake: Pour the batter into the prepared baking pan. Sprinkle the crumb topping evenly over the batter, followed by the sliced almonds.
8. Bake: Place the pan in the preheated oven and bake for 35-40 minutes or until a toothpick inserted in the center comes out clean.
9. Cool: Remove the cake from the oven and let it cool in the pan for 15-20 minutes. Transfer it to a wire rack to cool completely.
10. Slice and Serve: Once cooled, slice the cake into squares and serve.

Following these steps will lead you to an irresistible cake that everyone will love.