Good-Cooking - Chocolate Peanut Butter Brownies

Ingredients

• 1/2 cup creamy or crunchy peanut butter
• 1/4 cup butter, softened (1/2 stick)
• 1 cup firmly packed light brown sugar
• 2 eggs
• 1 teaspoon vanilla extract
• 1 cup self-rising flour
• 1 cup semisweet chocolate chips (6 ounces)