To prepare a vegan peanut butter chocolate pudding recipe, first you need to prepare your ingredients. First, you'll need: 1 cup (240 ml) of unsweetened cocoa powder. 2 tablespoons (14 g) granulated sugar. 1 teaspoon (2.5 grams) vanilla extract. 1/2 teaspoon (1 tsp) baking soda. 1/4 teaspoon salt. Mix all of the ingredients together. Pour the mixture into an 8x8x2 inch baking pan. Bake the pudding for 35 to 40 minutes, or until the center is set and the top is golden brown. Let the cake cool in the pan for 10 to 15 minutes before cutting it into squares.