Peanut Butter Chocolate Chunk Cookies

1 1/2 cups all-purpose flour (spooned and leveled)
1 teaspoon baking soda
1 cup peanut butter (smooth or chunky) (I used Jif smooth. I really like the smooth PB for this recipe)
4 tablespoons ( 1/2 stick) unsalted butter, room temperature
1/2 cup packed dark-brown sugar (I've made it with both light and dark brown sugar)
1/2 cup granulated sugar
2 large eggs
1 teaspoon pure vanilla extract
8 ounces semisweet chocolate, cut into chunks (I've used Nestle chips, chunks and Cadbury dark chocolate chips...all with delicious results!!)

1. Preheat oven to 350 degrees. In a bowl, whisk together flour and baking soda; set aside. With a Kitchen Aid and paddle, beat peanut butter, butter, and sugars until light and fluffy...about 3 minutes. Add eggs and vanilla, and beat until smooth. With mixer on low, gradually add flour mixture, beating just until combined. Stir in chocolate chunks.

2. Drop dough by heaping tablespoons, 1 inch apart, onto two large baking sheets. I used half-sheet pans and a Silpat or parchment paper. Bake until golden, 13 to 15 minutes, rotating sheets halfway through. Transfer cookies to wire racks to cool.

The Food Librarian blog:
Recipe & Photo on the Food Librarian blog (July 7,2010):
Original recipe: Everyday Food (Martha Stewart empire):