Preheat the oven to 350°F (175°C). Grease an 8x8-inch baking dish with butter or cooking spray.
In a medium bowl, whisk together the melted butter, cocoa powder, and sugar. Add the eggs and vanilla extract and mix until blended.
In a separate bowl, mix together the flour, baking powder, and salt. Add the dry ingredients to the wet ingredients and mix until just combined.
Stir in the walnuts, marshmallows, and chocolate chips. Pour the batter into the prepared baking dish and spread evenly.
Bake for 30 minutes, or until a toothpick inserted into the center comes out clean. Allow the cake to cool for 10 minutes before serving.
In a medium saucepan, heat the heavy cream over low heat until just simmering. Remove from heat and add the chocolate chips. Stir until the chocolate is melted and the mixture is smooth.
Pour the chocolate glaze over the cake and spread evenly. Serve immediately or store in an airtight container and refrigerate for up to 3 days.
Interesting Facts
Mississippi mud cake is a classic American dessert that originated in the state of Mississippi.
This cake is usually served with a scoop of ice cream or whipped cream.
Mississippi mud cake is an easy and delicious dessert that is perfect for any occasion.