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["Grease sides and bottom of an 8 x 8"" square baking pan. Line the bottom with parchment. Set aside. Preheat oven to 325 F.", "In a small bowl or measuring glass, smash the ripe bananas well with a fork (this should be quite easy if your bananas are the proper ripeness); a few small lumps are fine, as are juices. You should have a scant cup to a full cup of mashed banana; set aside.", "In a large bowl, whisk together the brown sugar and butter or coconut oil until smooth and lump free. Stir in the vanilla. Add egg yolks one at a time, gently whisking each one until incorporated. Sift the flour, baking soda, salt and cardamom over the butter mixture. Gently stir, trying not to incorporate air, until even and no traces of flour remain. Gently fold in the mashed banana until evenly dispersed. Spread batter evenly into lined pan.", "Cover top of pan with a piece of foil, poking a hole in its center to prevent sogginess. Bake for a total of about 40 minutes, stopping and rotating pan at the 20 minute mark. When nearing 40 minutes total, carefully lift foil (the steam is quite hot). Baking is complete when batter no longer moves or looks wet, and a toothpick inserted in the center tests clean. Not to worry if the surface looks uneven. Remove from oven and discard foil. Let pan cool completely, then transfer pan to refrigerator to chill.", "When ready to slice, loosen sides of chilled pan with a knife, then invert onto a cutting board and remove parchment. Leave upside down, smooth side up for cutting and glazing. If clean-cut squares are desired, trim any uneven edges to make straight lines. (The trimmings are crisp and caramelized: so delicious!) With a sharp knife, divide square into equal quadrants, then slice each quarter into nine equal squares, making 36 pieces total. Keep squares cool for the glazing process. While the squares are really wonderful plain, I opt for a crisp, sweet cocoa glaze (melted chocolate works well, too).", "Place the cool banana squares on a wire rack over a cookie sheet or platter. Sift together first three ingredients in a bowl.", "Whisk in vanilla and 2 tablespoons water. If too thick, add more water very gradually, whisking well after each addition. Lean toward thickness; if too watery, the glaze will soak into the squares and will not dry or get crisp.", "Spoon the glaze over the squares (about a teaspoon each). If desired, decorate with sprinkles or finely chopped nuts while glaze is still wet. Let sit at room temperature until glaze is dry to the touch, then transfer to mini cupcake liners if desired. Keep cool."]
