Spanakopita Baked Eggs

Name: Spanakopita Baked Eggs
Ingredients: ¼ cup extra-virgin olive oil; 1 bunch scallions, finely chopped; 6 garlic cloves, finely grated; ¼ tsp. crushed red pepper flakes; 2 10-oz. packages frozen spinach; ¾ cup heavy cream; Zest of 2 small lemons; 4 oz. feta, crumbled, plus more for serving; ⅓ cup finely chopped dill, plus more for serving; ½ tsp. Diamond Crystal or ¼ tsp. Morton kosher salt, plus more; ¼ tsp. freshly ground black pepper, plus more; 6 large eggs; Warm pitas (for serving)