Preheat oven to 350ºF. Spray two 8½ X 4½" loaf pans and set aside.Whisk together flour or gluten free flour, baking soda, baking powder, and salt in a bowl. With a stand mixer or electric mixture, beat peanut butter, butter, sugar, and light brown sugar in another large bowl until very light and fluffy, about 5 minutes. Beat in eggs, then vanilla. Slowly pour in buttermilk or soured milk, beating until combined.Gradually add flour mixture and beat on low until combined. Stir in miniature chocolate chips and divide between the two loaf pans.Bake 45 minutes or until toothpick inserted in middle comes out clean. Cool in pans on wire racks for 10 minutes, then remove from pans and cool completely.Peanut Butter Glaze:In a small microwave safe bowl melt 2 tbsp. peanut butter for about 20 seconds. Add powdered sugar and milk and stir vigorously until smooth. Drizzle over the loaves of bread with a spoon.Chocolate Glaze:In a small microwave safe bowl, combine ¼ cup chocolate chips and shortening or vegetable oil. Microwave for about 1 minute, stopping every 20 seconds to stir and smooth out. Drizzle over the top of the peanut butter glaze on bread loaves.