<human>: How can I make a delicious homemade chocolate cake?
<bot>: To make a delicious homemade chocolate cake, start by preheating your oven to 350°F (177°C). Grease and flour a 9x13 inch pan. In a large bowl, sift together the flour, cocoa powder, baking soda, and salt. Set aside. In a separate bowl, combine the butter, sugar, and vanilla extract until creamy. Slowly mix in the eggs, one at a time. Add the dry ingredients to the wet mixture and stir until just combined. Gently fold in the melted chocolate. Finally, add the chopped chocolate and stir to distribute evenly throughout the batter. Pour the batter into the prepared pan and bake for 30-35 minutes or until a toothpick inserted into the center comes out clean. Let cool before serving. Enjoy!