Step 1: Preheat the Oven

• Preheat your oven to 350°F (175°C) and grease a 12-inch pizza pan or a round baking dish.

Step 2: Mix the Brownie Batter

• In a large mixing bowl, combine the melted butter and granulated sugar, stirring until well blended.
• Add the eggs one at a time, mixing thoroughly after each addition, then stir in the vanilla extract.
• In a separate bowl, whisk together the flour, cocoa powder, salt, and baking powder.
• Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Avoid overmixing to keep your brownies tender.

Step 3: Bake the Brownie Base

• Pour the brownie batter into the prepared pizza pan and spread it evenly.
• Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.

Step 4: Cool the Brownie

• Allow the brownie to cool completely in the pan on a wire rack. This will make it easier to frost and decorate.

Step 5: Frost the Brownie Pizza

• Once the brownie is completely cool, spread a generous layer of frosting on top. You can use a spatula or a butter knife to create fun designs.

Step 6: Add the Toppings

• Get creative! Scatter candy corn, chocolate candies, crushed Oreos, mini marshmallows, and sprinkles all over the frosted brownie. Arrange them however you like for a festive look.