SQUARE 5INCH 6INCH 7INCH 8INCH 9INCH 10INCH INGREDIENTS SELF RAISNG FLOUR 45g 60g 85g g g g. BAKING POWDER 1/4tsp 1/2 tsp 3/4tsp 1tsp tsp 2tsp. For a 10" tin, I would use the following: beat 6 oz butter (softened in microwave) and caster sugar together. Beat in 3 medium eggs. Sift in 6oz self raising. My fall back sponge recipe uses a basic mix that I factor up based on the number/size of tins. For a 10" tin, I would use the following: beat 6 oz butter .