💡 Pro Tip: Use real cinnamon (not “spice blend”) for authentic warmth.
Step-by-Step Instructions
1. Prep & Preheat
Preheat oven to 350°F (175°C).
Grease a 9×13-inch baking pan; line with parchment for easy removal.
2. Make the Cake Batter
In a large bowl, whisk flour, sugar, baking powder, and salt.
Stir in melted butter, milk, eggs, and vanilla until smooth.
3. Make the Cinnamon Filling
In a small bowl, beat softened butter, brown sugar, cinnamon, and flour until crumbly and spreadable.
4. Assemble the Cake
Pour half the batter into the pan; spread evenly.
Drop ¾ of the filling in dollops over batter; swirl gently with a knife.
Top with remaining batter; spread carefully.
Drop remaining filling on top; swirl again lightly.
✨ Don’t over-swirl—you want distinct ribbons of gooey cinnamon!
5. Bake to Perfection
