Preheat the oven to 190C degrees.
Make the red pepper sauce: put all ingredients into a food processor, then whiz until you get a smooth paste.
Cut or shred the chicken meat into small pieces. Put these into a bowl. Add the sweetcorn and olives or mushroom.
Pour over half of the red pepper sauce, season to taste and combine. Set aside.
Line a large baking sheet with parchment paper.
Unroll the pastry and cut it into 6 rectangular shapes. Fold back the edges of each piece to create a border.
Put the tartlets onto the lined baking sheet.
Brush some of the leftover red pepper sauce on the base, up to the borders. Spoon the chicken filling on top, spreading it out evenly - make sure it doesn’t go over the borders.
Brush the borders with the beaten egg.
Scatter some cheese on ton top of each or some of tartlets if you like.
Bake for about 20 minutes until the pastry is risen and the borders are golden.
Serve warm or at room temperature.