Preheat the oven to 350°F (175°C) and grease three 9-inch round cake pans.

In a large bowl, melt the butter and whisk in the granulated sugar until smooth.

Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.

In a separate bowl, sift together the flour, cocoa powder, and salt. Gradually mix the dry ingredients into the wet ingredients until just combined.

Fold in the chocolate chips.

Divide the batter evenly among the prepared cake pans.

Bake for about 25-30 minutes, or until a toothpick inserted into the center comes out clean.

Let the cakes cool in the pans for 10 minutes, then transfer to a wire rack to cool completely.

For the frosting, beat the heavy cream, powdered sugar, and vanilla extract until soft peaks form.

Once the cakes are completely cool, place one layer on a serving plate and spread a layer of frosting on top. Repeat with the second layer.

Place the third layer on top and frost the entire cake.

Decorate with chocolate shavings or additional chocolate chips if desired.