Preheat oven to 350°F (175°C). Grease and line two 8-inch round cake pans with parchment paper.
In a bowl, whisk together flour, cocoa powder, baking powder, and salt.
In a separate large bowl, beat butter and sugar until fluffy. Add eggs one at a time, then stir in melted chocolate.
Alternate adding dry ingredients with milk, mixing until smooth. Fold in cherries and cognac.
Divide batter into pans. Bake 25–30 minutes or until a toothpick comes out clean. Cool completely.
Heat cream until steaming. Pour over chopped chocolate, stir until smooth. Add cognac if desired.
Assemble cake with glaze between layers and on top. Garnish with cherries and chocolate shavings.