Begin by preheating your oven to 375 degrees and lining a rimmed cookie sheet with wax paper. In a small bowl, sift together 1 cup flour, 1 1/2 teaspoons baking powder, and 1/4 teaspoon salt. In a separate larger bowl, beat 4 medium eggs until thick, then gradually beat in 1 1/2 cups sugar.
Blend in 1/2 cup water and 1/2 teaspoon vanilla extract, then gradually add the sifted dry ingredients and beat just until smooth. Pour the batter onto the wax-lined rimmed cookie sheet and spread evenly with a spatula.
Bake the cake for 12-15 minutes at 375 degrees until golden and set. While the cake is still hot and fresh from the oven, the magic happens: roll it in a towel that has been covered with 1/4 cup confectioners' sugar. This essential step creates the characteristic spiral shape of a roll cake.
Place the rolled cake in the refrigerator and allow it to cool completely, which typically takes about one hour.
Once the cake is completely cooled, remove it from the refrigerator and carefully unroll it. Spread 12 ounces of whipped topping evenly across the cake's surface and sprinkle with 16 ounces of fresh strawberries that have been chopped. Re-roll the cake gently to enclose the filling. Garnish the outside with additional strawberries, whipped topping, and/or powdered sugar before serving.