Preheat the Oven:

Preheat your oven to 350°F (175°C). Grease a 9x9-inch baking pan or line it with parchment paper.

Make the Brownie Batter:

In a mixing bowl, whisk together the melted butter and sugar until smooth. Add the eggs and vanilla extract, mixing until fully incorporated.

Combine Dry Ingredients:

In a separate bowl, sift together the flour, cocoa powder, salt, and baking powder. Gradually fold the dry ingredients into the wet mixture until just combined.

Pour into the Pan:

Spread the brownie batter evenly into the prepared baking pan.

Add the Churro Topping:

In a small bowl, mix the granulated sugar and ground cinnamon. Sprinkle the cinnamon-sugar mixture evenly over the top of the brownie batter.

Bake:

Bake in the preheated oven for 30–35 minutes, or until a toothpick inserted in the center comes out with moist crumbs.

Cool and Slice:

Allow the brownies to cool completely in the pan before slicing into squares.

Optional Drizzle:

Drizzle melted chocolate or caramel sauce over the brownies for an extra touch of indulgence.