Try this blueberry zucchini cupcake recipe.
Squeezing shredded zucchini in a dish towel is the single most important step to prevent a soggy, collapsed crumb in these cupcakes. Water trapped inside the vegetable will steam during baking, turning the surrounding batter dense and gummy. Standard kitchen towels often leave fibers clinging to the shreds, so use a tightly woven linen tea towel or unbleached cheesecloth for clean extraction. Once drained to two cups, the vegetable provides structural moisture rather than excess liquid. When combining wet components like eggs, oil, vanilla, and sugar, a handheld electric mixer provides adequate aeration without requiring a bulky stand mixer on a crowded countertop. Folding the dry ingredients by hand prevents gluten overdevelopment, which keeps the crumb tender. Gently incorporate fresh blueberries at the very end to avoid crushing the skins and bleeding dark pigment throughout the batter. Bake at 350 degrees F for 16 to 18 minutes, watching for a clean toothpick insertion in the center. Allow the baked goods to rest in the metal pans for precisely 20 minutes before transferring them to a wire cooling rack. Cooling too quickly on wire without the initial pan rest can cause structural collapse along the edges. For the buttercream, beating the butter, confectioners sugar, salt, lemon juice, and vanilla for a full three to five minutes incorporates microscopic air bubbles essential for a light, spreadable consistency.