Preheat the oven to 350.

Line two round baking pans with parchment and spray the parchment with baking spray.

Melt the butter in a medium saucepan.

Mix in the cocoa and stir it until smooth.

Pour in boiling water, let the mixture bubble up around 20 seconds; turn it off and set it aside.

In a measuring pitcher or bowl, mix together the buttermilk, baking soda, eggs and vanilla. Set this aside.

In a large mixing bowl, mix together the sugar, flour and salt.

Stir in the hot chocolate mixture, stirring gently until it's halfway combined and less hot. Pour in the buttermilk mixture and continue stirring gently until the batter is all combined.

Pour the batter into the pans and bake them for approximately 17 minutes until they're just set. Remove from the pans and set them aside to cool completely.

Prepare the strawberries: stir them with the sugar and the vanilla. Let them macerate for 15 minutes, and drain off the excess juice.

Whip the cream with the powdered sugar.

To assemble: turn one layer upside down on a serving platter.

Spread half the Nutella all over the surface.

Spread on half the whipped cream and top with half the strawberries

Place the other layer upside down on top and repeat with the rest of the Nutella, whipped cream, and strawberries.

Keep chilled until serving and cut with a serrated knife!