Ingredients:

For the Cake:

• 1 cup (2 sticks) unsalted butter, softened
• 2 cups granulated sugar
• 4 large eggs
• 1 teaspoon vanilla extract
• 2 cups all-purpose flour
• 1/2 cup unsweetened cocoa powder
• 1 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 1 cup buttermilk

For the Chocolate Frosting:

• 1 cup (2 sticks) unsalted butter, softened
• 2/3 cup unsweetened cocoa powder
• 3 cups powdered sugar
• 1/3 cup milk
• 1 teaspoon vanilla extract
• Pinch of salt

Instructions:

1. Preheat the Oven:
   • Preheat your oven to 350°F (180°C). Grease and flour two 9-inch round cake pans.
2. Prepare the Cake Batter:
   • In a large bowl, cream together the softened butter and granulated sugar until light and fluffy.
   • Add the eggs one at a time, beating well after each addition. Stir in the vanilla extract.
3. 
   
   Combine Dry Ingredients:
   • In a separate bowl, whisk together the flour, cocoa powder, baking powder, baking soda, and salt.
4. Alternating Additions:
   • Gradually add the dry ingredients to the wet ingredients, alternating with the buttermilk. Begin and end with the dry ingredients, mixing just until combined.
5. Divide and Bake:
   • Divide the batter evenly between the prepared cake pans. Smooth the tops with a spatula.
   • Bake in the preheated oven for 25-30 minutes or until a toothpick inserted into the center comes out clean.
6. Cool the Cakes:
   • Allow the cakes to cool in the pans for 10 minutes, then transfer them to a wire rack to cool completely.
7. 
   
   Prepare the Chocolate Frosting:
   • In a large bowl, beat together the softened butter, cocoa powder, powdered sugar, milk, vanilla extract, and a pinch of salt until smooth and creamy.
8. Assemble the Cake:
   • Once the cakes are completely cooled, spread a layer of chocolate frosting on top of one cake layer.
   • Place the second cake layer on top and frost the top and sides of the entire cake.
9. Decorate (Optional):
   • Decorate the cake with additional chocolate shavings, sprinkles, or as desired.
10. Slice and Serve:
    • Slice the cake and serve it on a platter. Enjoy your butter chocolate cake!

This rich and moist butter chocolate cake is sure to be a crowd-pleaser, perfect for any celebration or sweet craving.