1Preheat your oven to 350°F (175°C) and grease a 9-inch round cake pan.
In a large bowl, whisk together the all-purpose flour, sugar, baking powder, and salt.
In another bowl, mix the peanut butter, milk, vegetable oil, and vanilla extract until smooth.
Gradually add the wet ingredients to the dry ingredients, stirring until just combined.
Pour half of the batter into the prepared cake pan.
Spread the jelly evenly over the batter.
Pour the remaining batter over the jelly layer, spreading it evenly.
Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted into the center comes out clean.
Allow the cake to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.
Serve and enjoy your Peanut Butter and Jelly Cake!