Nutella-Swirled Blondies

I made these simple blondies a really long time ago and came across the pics recently- lo.  I think I made them last fall. They were easy to make and really good, and were eaten up in no time.

Nutella-Swirled Blondies
adapted from Averie Cooks

1/2 cup unsalted butter (1 stick), melted
1 large egg
1 cup light brown sugar, packed
1 tablespoon vanilla extract
1 cup all-purpose flour
1 cup Reese's Peanut Butter Chips (chocolate chips may be substituted)
about 1/3 cup Nutella

1.  Preheat oven to 350F. Line an 8-by-8-inch baking pan with aluminum foil, spray with cooking spray; set aside. (I skipped the foil; just used cooking spray on the pan.)

2.  In a large, microwave-safe bowl melt the butter, about 1 minute on high power. (Or use a saucepan on the stove.) Wait momentarily before adding the egg so you don't scramble it. Add the egg, brown sugar, vanilla, and whisk until smooth.  Add the flour and stir until just combined, don't over-mix. Stir in the peanut butter chips. Turn batter out into prepared pan, smoothing the top lightly with a spatula.

3.  Evenly add and swirl the Nutella- 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.

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