Step 1: Prepare Oven & Pan

Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish with nonstick spray or butter and set aside.

Step 2: Make the Brownie Base

In a large mixing bowl, prepare the brownie mix according to package instructions, adding the vegetable oil and eggs called for on the box. Mix until the batter is smooth and homogeneous.

Step 3: First Layer

Spread half of the prepared brownie batter evenly into the prepared baking dish, using a spatula to smooth the surface.

Step 4: Honey-Cinnamon Swirl

In a medium bowl, whisk together the honey, brown sugar, and ground cinnamon until fully combined and glossy.

Drizzle this honey mixture evenly over the brownie batter in the pan.

Step 5: Top with Remaining Brownie Batter

Using a spoon, drop spoonfuls of the remaining brownie batter over the honey mixture. It doesn’t need to cover everything — the contrast makes a beautiful marbled effect.

Step 6: Create the Swirl

Take a butter knife or skewer and gently swirl the brownie batter and honey mixture together. Use broad, sweeping motions to create a marbled pattern. Avoid over-mixing — you want distinct swirls.

Step 7: Bake

Bake the brownies in the preheated oven for 25–30 minutes. They are done when the edges appear set and a toothpick inserted into the center comes out with a few moist crumbs, but not raw batter.

Step 8: Cool and Serve

Allow the brownies to cool completely in the pan on a wire rack. This helps them firm up and makes slicing easier. Once cool, cut into squares and serve.