1 large egg
1 cup light brown sugar, packed
1 tablespoon vanilla extract
1 cup all-purpose flour
1 cup chocolate chips
about 1/3 cup Nutella (more if you wish)
- Preheat oven to 350F. Line an 8-by-8-inch baking pan with aluminum foil, spray with cooking spray; set aside.
- In a large, microwave-safe bowl melt the butter, about 1 minute on high power.
- Cool briefly before adding the egg so that it doesn't cook. Add the egg, brown sugar, vanilla, and whisk until smooth.
- Add the flour and stir until just combined, don't overmix. Stir in the chocolate chips.
- Turn batter out into prepared pan, smoothing the top lightly with a spatula.
- Evenly add and swirl the Nutella. To create the marbled pattern shown, drizzle Nutella over batter in 5 wide, evenly spaced, parallel lines, each spanning the length of the pan. Like 5 rows of long train tracks. Rotate pan 90-degrees. With a toothpick, starting at the top of the pan, "draw" 4 or 5 evenly spaced lines through the Nutella. You're dragging the toothpick perpendicularly through the first set of lines to create the marbling.
- Bake for about 20 to 25 minutes, or until done. A toothpick inserted in the center should come out clean, or with a few moist crumbs, but no batter. Allow bars to cool in pan for at least 30 minutes before slicing and serving.