Ingredients
Method
- Preheat oven to 350°F; parchment-line baking sheet.
- Mix brownie mix, espresso, vanilla, and eggs/oil/water per box; fold in chocolate chips and optional flour if too wet.
- Shape log about 12 inches long and 2–3 inches wide on sheet; brush beaten egg.
- Bake 20–25 minutes until set. Cool 10 minutes; slice diagonally into 3/4-inch pieces.
- Reduce oven to 300°F. Arrange slices cut-side down; bake 10–12 minutes per side until crisp.
