In a small bowl, stir together mayonnaise and chili powder to make an aïoli.
Using a 2-inch round cutter, cut 12 rounds from frozen bread slices, discarding scraps. Spread ¼ teaspoon aïoli onto a bread round and top with a cucumber slice. Spread another ¼ teaspoon aïoli onto cucumber and top with 2 mint leaves Fold a ham slice into thirds, and roll into a rosette. Place ham rosette on top of canapé, gently pressing into aïoli. Repeat with remaining ingredients. Serve immediately.
Recipe by TeaTime Magazine at https://teatimemagazine.com/minty-ham-canapes/