Peanut-butter Swirl Brownies

My four-year-old son is very bright and aware of the days of the week and what we do on each day - he keeps me on track!. For instance, Family Night, Bath Nights, Movie Nights, etc. The other day he asked me what we were having for Treat Night. When I asked him what nights those are, he said Sunday and Monday! :)

When I was growing up, it was not unusual to have our big Sunday meal at lunch time, and popcorn and a freshly-baked cookies or dessert for dinner. I guess I unknowingly have incorporated this into our family routine as well!

-Filling from Martha Stewart

Brownie recipe of choice - I just used a Betty Crocker brownie mix

Filling:
4 Tbsp unsalted butter, melted
1/2 cup powdered sugar
3/4 cup peanut butter
1/4 tsp. salt (omit if using salted butter)
1/2 tsp. vanilla

Preheat oven to 350. Spray a glass 11x7 baking dish.

Make brownies according to recipe or directions on box. Prepare filling.

Pour 1/2 of batter into prepared pan; spread evenly with a rubber spatula. Drop dollops of peanut butter filling (about 1 tablespoon each) on top of batter, spacing about 1 inch apart. Drizzle remaining batter on top, and gently spread to fill pan. Drop dollops of remaining filling on top. Gently swirl peanut butter filling into batter with a butter knife, running the knife lengthwise and crosswise through layers.

Bake until a cake tester inserted into brownies (avoid center and edges) comes out with a few crumbs but is not wet, about 45 minutes.