Chocolate Peanut Butter Pretzel Bars
Preheat the oven to 350° Fahrenheit. Butter a 9-by-13-inch pan.
Using a mixer, beat the butter with both sugars at medium speed until light and fluffy, about 2 minutes. Beat in the eggs and vanilla extract. On low, sprinkle the baking soda in, and then beat in the flour in half-cup increments, just until incorporated. Stir in the chocolate and peanut butter chips and pretzel pieces.
Spread the batter evenly in the buttered pan. Press the batter down with a spatula. Bake for 30 minutes, until golden brown. The middle might be a little gooey but the bars will set up as they cool. Transfer the pan to a rack and let cool completely before cutting.