Preheat your oven to 350°F (175°C) and grease your baking dish.

In a bowl, whisk together flour, cocoa powder, sugar, and baking powder.

In another bowl, mix eggs, oat milk, and vanilla until smooth.

Combine wet and dry ingredients gently; avoid overmixing. Fold in any extras like chocolate chips if desired.

Pour batter into the prepared dish and bake for 25-30 minutes or until a toothpick comes out clean.

Let cool slightly before poking holes with a fork. Drizzle chocolate syrup generously over the cake and allow it to soak in.