HOW TO MAKE IT :
- Preheat the oven to 350°F (177°C) and generously grease a 9×5 inch loaf pan.
- Make the cake: Whisk the flour, baking powder, and salt together. Set aside.
- Using a handheld or stand mixer fitted with a paddle or whisk attachment, beat the butter and sugar together on medium-high speed until smooth and creamy, about 2 minutes. Scrape down the sides and up the bottom of the bowl with a rubber spatula as needed. Add the eggs and beat on high speed for 1 minute, then beat in the sour cream and vanilla extract. Scrape down the sides and up the bottom of the bowl as needed. The mixture will be very lumpy and appear curdled– that’s ok. Pour the dry ingredients into the wet ingredients. Turn the mixer to low speed and as the mixer runs, slowly pour in the milk. Beat on low speed just until all of the ingredients are combined. Do not over-mix. You may need to whisk it all by hand to make sure there are no large lumps at the bottom of the bowl. The batter will be slightly thick. Gently fold in the chocolate chips.
- Pour and spread batter evenly into prepared loaf pan.
- Bake for about 60-75 minutes or until a toothpick inserted in the center comes out clean. That time is a guideline— all ovens differ, so keep a close eye on the cake after 55 minutes. If the cake is browning too quickly on top, loosely tent with aluminum foil as it bakes.
- Cool cake in the pan set on a wire rack for at least 1 hour before removing from the pan. Feel free to continue cooling it directly on a wire rack or slice and enjoy then. (It will still be slightly warm.) You can drizzle the topping on the cake when the cake is still slightly warm after that 1 hour of cooling or wait until the cake has cooled completely to top it.
- Optional Topping: Stir and melt chocolate chips and peanut butter together in a small saucepan over medium heat on the stove or in a heatproof bowl using the microwave. We usually use the microwave and melt in 30 second increments, stirring after each until smooth. Drizzle over cake. Topping sets into a fudge-like consistency after several hours.
- Cover leftovers tightly and store cake (with or without topping) at room temperature for 3 days or in the refrigerator for up to 1 week.
Notes
- Freezing Instructions: Topped or plain cake freezes well up to 3 months. Thaw overnight in the refrigerator, then bring to room temperature or serve cold.
- Sour Cream & Milk: Feel free to replace the sour cream with lowfat plain yogurt. For best results, use whole milk. Lower fat or nondairy milks work in a pinch. If you want to use buttermilk, you absolutely could but we recommend replacing the milk AND sour cream with buttermilk. Use 3/4 cup buttermilk.
- Chocolate Chips: 1 standard 12 ounce bag is enough for this recipe. You can use regular size chocolate chips in both the cake and topping. We prefer using mini because you get more in each bite and for the topping, they melt down easier. We use semi-sweet, but milk chocolate or dark chocolate work too. We’re sure white chocolate or butterscotch morsels would be tasty as well.
- Peanut Butter: For best results, use processed creamy peanut butter such as Jif or Skippy. We do not recommend oily or natural style peanut butter because the topping will separate.
- Topping Options: See blog post for other topping options.
- Cupcakes/Muffins: We haven’t tested this recipe as cupcakes, muffins, or mini muffins, so let us know if you do. We imagine it would work just fine, but aren’t sure of the quantity. We recommend following the same baking instructions (steps 1 and 3) as our banana muffins.
- 1 layer cake: This batter will fit in a 9-inch greased square pan and take about 45 minutes to bake through at 350°F (177°C). The batter will not fit or bake evenly in a 9-inch round cake pan.
- Bundt Cake: We haven’t tested this recipe as a bundt cake, but we recommend doubling the batter and using a 10-12 cup bundt cake pan. Bake at 350°F (177°C). We’re unsure of the best bake time. The batter, without doubling, would yield a very short bundt cake.
- Why is everything at room temperature? All refrigerated items should be at room temperature so the batter mixes together properly. Read here for more information.
