Peanut Butter Cake

Prepare the Cake: Preheat oven to 350°F. Spray a 13- x 9-inch pan with baking spray with flour; set aside. Beat butter with a stand mixer fitted with a paddle attachment on medium speed until creamy, about 1 minute. Gradually add sugar, and beat until light and fluffy, about 5 minutes. Add eggs, 1 at a time, beating just until blended after each addition and stopping to scrape down side of bowl as needed. Add peanut butter; beat until smooth, about 1 minute.

Whisk together flour, baking soda, and salt in a medium bowl. With mixer running on low speed, add flour mixture and buttermilk, in alternating batches, to butter mixture, starting and ending with flour mixture and making sure each addition is fully incorporated before adding the next. Stir in vanilla. Spoon mixture into prepared pan, and smooth top with a small off-set spatula.

Bake in preheated oven until cake is light brown and a wooden pick inserted in center comes out clean, 35 to 40 minutes . Remove from oven, and let cool in pan on a wire rack until completely cool, about 2 hours.

Prepare the Frosting: Beat cream cheese, butter, and peanut butter with a stand mixer fitted with a paddle attachment on medium speed until creamy and blended, about 2 minutes. With mixer running on low speed, slowly add powdered sugar and salt, beating until well incorporated, about 2 minutes. Add vanilla, and beat on low speed until incorporated, about 10 seconds. Add cream, 1 teaspoon at a time, until frosting reaches desired consistency. Spread frosting over top of cooled cake, and sprinkle with peanuts.