Creating the Lemon Raspberry Swirl can be straightforward if you follow these simple steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease and flour an 8-inch round cake pan.

2. Prepare the Raspberries: In a small bowl, mash the raspberries gently using a fork. Set aside.

3. Mix Dry Ingredients: In a medium bowl, sift together the flour, baking powder, baking soda, and salt. Set aside.

4. Cream Butter and Sugar: In a large bowl, beat the softened butter and granulated sugar until fluffy and light in color.

5. Add Eggs: Beat in the eggs, one at a time, mixing well after each addition.

6. Incorporate Wet Ingredients: Stir in the buttermilk, lemon juice, lemon zest, and vanilla extract until well combined.

7. Combine Mixtures: Gradually add in the dry ingredients to the wet mixture, folding gently until just combined.

8. Layer the Batter: Pour about half of the batter into the prepared pan. Then, drop spoonfuls of the mashed raspberries on top. Pour the remaining batter over the raspberries.

9. Swirl Together: Use a knife to gently swirl the batter and raspberries together, creating a marbled effect. Be careful not to overmix.

10. Bake: Place in the preheated oven and bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.

11. Cool: Remove from the oven and let it cool in the pan for 10 minutes. Then, transfer it to a wire rack to cool completely.

12. Serve: Once cool, slice and serve as desired. You can top it with whipped cream or enjoy it plain.

These steps will guide you in effortlessly creating this delightful dessert that both looks and tastes sensational.