Heat your oven to 350°F/175°C. Spray a round or square 8-inch cake pan with vegetable spray. You can also place a piece of parchment paper at the bottom of the pan and spray the sides with vegetable oil.
Combine in a large mixing bowl the flour, sugar, peanut butter powder, salt and baking soda. Stir to combine.
In a smaller bowl, combine the vegetable oil, water, vinegar, and vanilla. Stir to combine.
Pour the water mixture into the flour mixture. Stir until combined.
Pour the batter into your prepared pan. Bake for 30 to 35 minutes until a toothpick inserted in the middle comes out clean.
Allow the cake to cool for about 10 minutes before inverting onto a serving plate. Sprinkle the top with powdered sugar or top with Peanut Butter Frosting*
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Notes
*Make peanut butter frosting by combining 2 tablespoons peanut butter, 1 cup powdered sugar, and 2 tablespoons peanut butter powder. Stir to combine. It will be crumbly. Add 1 teaspoon vanilla-flavored plant-based milk. Stir to combine. Continue adding 1 teaspoon of plant-based milk at a time until you get a spreadable consistency.Nutritional estimates are for the cake only.