Preheat the oven to 356°F (180°C) and line a cake pan with parchment paper.
In a mixing bowl, combine milk, sugar, corn oil, and egg (or egg replacement).
Add gluten-free rice flour, cocoa powder, and baking powder. Sift the dry ingredients together.
Mix the batter until smooth.
Pour half of the batter into the prepared cake pan.
Fill the middle with chocolate (e.g., salted pretzels).
Pour the remaining batter on top.
Sprinkle chocolate chips over the batter.
Bake in the preheated oven for 45 minutes.
Once baked, let the cake cool before slicing and serving. Enjoy!
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