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

In a large bowl, combine flour, sugar, baking powder, and salt, mixing well to distribute evenly

In another bowl, whisk together eggs, milk, vanilla extract, and melted butter until smooth

Gradually add the wet ingredients into the dry ingredients while mixing gently

Stir until just combined; avoid overmixing to keep the cake soft and tender

Pour the batter evenly into the prepared baking dish and smooth the surface

In a separate bowl, prepare the cinnamon swirl by mixing softened butter, brown sugar, flour, and cinnamon until thick and creamy

Drop spoonfuls of the cinnamon mixture evenly over the cake batter

Using a knife or skewer, gently swirl the mixture into the batter to create a marbled effect

Do not over-swirl; visible ribbons of cinnamon will create the best texture and flavor

Place the cake in the oven and bake for 30–35 minutes

Check doneness by inserting a toothpick into the center; it should come out mostly clean with a few moist crumbs

Remove from oven and allow the cake to cool slightly while preparing the glaze

In a bowl, whisk powdered sugar, milk, and vanilla extract until smooth and pourable

Adjust milk quantity for desired consistency (thicker or thinner glaze)

Drizzle the glaze generously over the warm cake

Let it soak slightly into the cake for that signature gooey cinnamon roll texture

Allow cake to cool for 10–15 minutes before slicing