According to Wilton chart, you get 45 servings from a 9x13 - can someone explain how please? Slices must be smaller than the standard 1.5x2"?
That chart refers to a 2-layer cake. A single layer 9x13 yields 24 (approx 2x2x2) servings. A 2-layer 9x13 therefore will serve 48 (approx 1x2x4) servings.
Sorry, I should've specified - party size, 2 layer.