Preheat the oven to 350°F (175°C) and line a jelly roll pan with parchment paper.
In a mixing bowl, beat egg whites, lemon juice, and salt until frothy. Gradually add sugar and continue beating until soft peaks form.
Sift in the cake flour and gently fold it into the mixture, being careful not to deflate the batter.
Divide the batter into separate bowls and add gel food coloring to each. Drop spoonfuls onto the baking sheet and swirl lightly with a skewer for a marbled effect.
Bake for 10-12 minutes or until the cake springs back when touched.
While the cake is still warm, dust a clean kitchen towel with powdered sugar and carefully roll the cake with the towel inside. Let it cool completely.
For the filling, beat the cream cheese, sugar, and vanilla until smooth. In a separate bowl, whip the heavy cream until stiff peaks form, then fold it into the cream cheese mixture. Stir in the crushed Easter candies.
Unroll the cooled cake, spread the filling evenly, then gently roll it back up. Refrigerate for at least an hour before slicing.
Dust with powdered sugar before serving.