Begin your chocolate adventure by preheating your oven to 350°F (175°C) and greasing a 9×13 inch baking pan. In a large bowl, sift together the all-purpose flour, granulated sugar, cocoa powder, baking soda, baking powder, and salt, ensuring a smooth blend. In another bowl, whisk together the eggs, room temperature buttermilk, hot water, vegetable oil, and pure vanilla extract until combined. Gently fold the wet mixture into the dry ingredients until you achieve a silky batter without any lumps.

Pour the luscious cake batter into your prepared baking pan, spreading it evenly. Slide it into your preheated oven and bake for 35–40 minutes, or until a toothpick inserted in the center comes out clean. After baking, remove it from the oven and let the cake cool completely in the pan on a wire rack, allowing the rich chocolate aroma to fill your kitchen.

Once cooled, use the handle of a wooden spoon or a skewer to poke holes all over the surface of the cake, spacing them about 1 inch apart. This step is essential for allowing the creamy peanut butter glaze to seep into the cake, creating that delightful Chocolate Peanut Butter Poke Cake experience that everyone will love.

In a saucepan over low heat, combine the smooth peanut butter, sweetened condensed milk, and whole milk. Stir continuously until the mixture is warm and perfectly smooth, avoiding any lumps. Once ready, pour the warm glaze generously over the poked cake, making sure it seeps into all those holes for maximum flavor.

In a chilled mixing bowl, pour in the heavy whipping cream and whip it until soft peaks begin to form. Gradually add the sifted powdered sugar, smooth peanut butter, and a splash of vanilla extract. Continue whipping the mixture until you achieve stiff peaks, resulting in a light and airy peanut butter whipped cream that will elevate your cake.

Spread the fluffy peanut butter whipped cream evenly over the top of your now-glazed cake, creating a beautiful layer. For a touch of decadence, garnish with chopped chocolate peanut butter cups and a sprinkle of peanuts. This finishing touch not only enhances presentation but also adds a delightful crunch to your indulgent Chocolate Peanut Butter Poke Cake, inviting everyone to dig in!