Triple Chip Blondies

Source:  Kristie C. (via ourbestbites.com)

1 c. (2 sticks) salted butter
2 c. light brown sugar
2 t. vanilla
2 eggs
2 cups flour
2/3 c. chocolate chips, plus 1/3 c. for drizzling on top
2/3 c. white chocolate chips
2/3 c. peanut butter chips (or butterscotch chips)
1 t. oil

Preheat oven to 350.  Spray 9x13 pan, set aside.
Melt the butter.  Combine in a large mixing bowl with the brown sugar.  Add the vanilla and the eggs and beat on medium until well combined.  Add the flour and mix until just combined.  Add all of the chips (excluding the 1/3 c of chocolate chips reserved for drizzling) and mix until well combined.
Transfer batter to the pan and bake for 20-25 minutes or until golden brown on top.  Allow to cool completely.  When cool, combine the reserved chips and the oil in a small ziplock bag, seal it, and heat the microwave in 15 second intervals, mashing the bag with your hands until the chocolate and oil are smooth.  Repeat as long as necessary.  Cut a small corner out of the bag and squeeze the melted chocolate over the baked blondies.  Allow to cool completely before cutting into bars.