To prepare a raspberry swiss roll recipe, first you need to prepare the ingredients. First, you'll need the following ingredients: 1/2 cup granulated sugar, 1 teaspoon vanilla extract, and 1 tablespoon melted butter. You can also use powdered sugar if you don't want to use the vanilla. Then, add the dry ingredients to the wet ingredients and mix until they're just combined. Next, pour the batter into the prepared pan and bake for 20 minutes or until the top is golden brown. Remove the pan from the oven and allow the rolls to cool for 5 minutes before serving.