Spanakopita-Inspired Potato Crust Quiche

Name: Spanakopita-Inspired Potato Crust Quiche
Cook time: 1 h 55 min
Total time: 1 h 55 min
Cuisine: American
Ingredients: 1 (24-ounce) package baby yukon gold potatoes, scrubbed; 2 tablespoons., plus 2 1/2 teaspoons kosher salt, divided (such as Diamond Crystal); 4 tablespoons extra virgin olive oil, divided; 1 cup chopped yellow onion; 1 (10-ounce) package. frozen chopped spinach, thawed, drained, and squeezed dry; 1 (6-ounce) package crumbled garlic and herb feta (about 1 cup); 8 large eggs; 1/2 cup heavy whipping cream; 4 teaspoons chopped fresh dill, plus more for garnish; 4 teaspoons chopped fresh mint, plus more for garnish; 1 teaspoon grated lemon zest; 3/4 teaspoon garlic powder