Preheat Oven and Grease:
Heat oven to 400°F (205°C). Coat a 12-cup muffin tin with olive oil or nonstick spray.Shred and Squeeze Vegetables:
Shred zucchini and potatoes using a box grater. Transfer to a clean kitchen towel and wring out excess moisture (critical for crispness).Mix Zucchini Muffin Batter:
In a large bowl, mix together shredded zucchini, potatoes, onion, eggs, Parmesan, breadcrumbs, garlic, salt, pepper, and oregano until well blended.Fill Muffin Cups Firmly:
Fill each muffin cup with the mixture, pressing down firmly with the back of a spoon to pack tightly.Drizzle Oil and Bake:
Lightly drizzle olive oil over the tops. Bake for 25–30 minutes, until golden brown and crispy at the edges.Cool and Serve Warm:
Allow muffins to cool in the pan for 5 minutes, then remove. Serve warm as a side or snack.