1. Preheat the oven to 450 degrees.

2. Using a paring knife, cut a very small slice from the bottom of the banana to help it stay flat on the baking sheet. Cut out a rectangle from the top of the banana and remove that piece of the peel. Using the small end of a melon baller, scoop out some of the banana. Repeat with the remaining three bananas. Wrap each banana in parchment paper and tin foil, leaving the cavity exposed.

3. Sprinkle the dark chocolate chips and walnuts into each banana and press them into the cavity. Top with the mini marshmallows.

4. Transfer to a baking sheet and bake for 12 minutes.

5. Once the marshmallows turn golden-brown, remove from the oven and allow them to cool for 5 to 10 minutes.

6. Drizzle with chocolate sauce and sprinkle with chopped strawberries. Serve warm!