Step 1
Preheat oven to 180C/160C fan-forced. Grease 4 large baking trays. Line with baking paper.
Step 2
Sift flour, cream of tartar and bicarbonate of soda into a large bowl. Stir in sugar. Add butter, vanilla and egg. Mix well to combine. Roll level tablespoons of mixture into balls. Flatten each ball into a disc and place on prepared trays, 5cm apart. Top with jelly beans, pretzels and M&M’s, pressing to secure (see note).
Step 3
Bake cookies, 2 trays at a time, for 12 to 15 minutes or until just turning golden around the edges. Cool on trays for 5 minutes. Transfer to a wire rack to cool completely. Dust with sherbert. Serve.