Imagine the Snack Fairy tapping her wand on a piece of plain melba toast. Pecans, seeds, raisins, fragrant rosemary, and a kiss of honey appear, transforming it into an object of desire: Trader Joe’s Rosemary Raisin Crisps. Leave it to a Canadian to reverse engineer a recipephany for a similar cracker called Lesley Stowe’s Raincoast Crisps. Her blog, “Dinner with Julie,” shows how it is twice baked, like biscotti, but easier. You stir up tiny eggless quick breads, bake and freeze them, and then thinly slice the frozen bread and bake fresh crackers on demand. The crisps shrink to about 70 percent of their original size, perfect for spreading cheese (see Mock Boursin recipe…