1/2 cup unsalted butter, melted
1 large egg
1 cup light brown sugar, packed
1 tablespoon vanilla extract
1 cup all-purpose flour
1/2 to 1 teaspoon kosher salt
2 king-sized Snickers bars, diced into small pieces; divided
2/3 cup semi-sweet chocolate chips; divided
1. Preheat oven to 350 degrees F. Line an 8-by-8-inch baking pan with aluminum foil if desired for easier cleanup and spray with cooking spray; set aside.
2. To a large, microwave-safe bowl add the butter and heat to melt, about 1 minute on high power.
3. Wait momentarily before adding the egg so you don’t scramble it. Add the egg, brown sugar, vanilla, and whisk until smooth.
4. Add the flour, salt, and stir until just combined, don’t overmix.
5. Add the most of the Snickers pieces (reserve about 10-12 pieces to manually add to the top of the batter) chocolate chips (reserve about 1/4 cup to manually add to the top of the batter), and stir to combine.
6. Turn the batter out into the prepared pan, smoothing the top lightly with a spatula.
7. Evenly place the reserved Snickers and chocolate chips on top of the batter.
8. Bake for about 22 to 26 minutes, or until top is set in center and done; don’t overbake. Blondies firm up as they cool. A toothpick test is unreliable because you will likely hit melted chocolate or caramel, but if you hit a patch of dough, the toothpick should come out clean, or with a few moist crumbs, but no batter.
9. Place pan on a wire rack to cool for at least 90 minutes before slicing and serving.