Making the Blackberry Lime Cake can be straightforward if you follow these easy steps:

1. Preheat the Oven: Start by preheating your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans.
2. Mix Dry Ingredients: In a medium bowl, whisk together the flour, baking powder, baking soda, and salt.
3. Cream Butter and Sugar: In a large mixing bowl, beat the softened butter and granulated sugar until light and fluffy.
4. Add Eggs: Incorporate the eggs one by one into the butter and sugar mixture, beating well after each addition.
5. Incorporate Wet Ingredients: Mix in the buttermilk, lime zest, lime juice, and vanilla extract until combined.
6. Combine Mixtures: Gradually add the dry ingredients to the wet mixture, stirring just until no flour streaks remain. Do not overmix.
7. Fold in Blackberries: Gently fold in the fresh blackberries to avoid breaking them up too much.
8. Divide Batter: Pour the batter evenly into the prepared cake pans, smoothing the tops.
9. Bake: Place the pans in the preheated oven and bake for 30-35 minutes or until a toothpick inserted in the center comes out clean.
10. Cool the Cakes: After baking, remove the cakes from the oven and let them cool in the pans for about 15-20 minutes. Then, transfer them to wire racks to cool completely.
11. Prepare Frosting: While the cakes are cooling, prepare your favorite frosting—cream cheese frosting pairs wonderfully with the cake.
12. Assemble the Cake: Once the cakes are completely cool, place one layer on a serving platter. Spread a layer of frosting on top, followed by the second layer. Frost the top and sides of the entire cake.
13. Decorate: Garnish with additional blackberries and a sprinkle of lime zest for a stunning finish.

Following these steps will guide you toward creating an irresistible Blackberry Lime Cake that your friends and family will love.