Keto Calzone with Spinach and Cheese

Name: Keto Calzone with Spinach and Cheese
Prep time: 20 min
Cook time: 40 min
Total time: 1 h
Cuisine: Italian
Ingredients: 2 tablespoons butter; 1 clove garlic, minced; 3 cups (packed) baby spinach leaves, roughly chopped; 1/2 teaspoon onion powder; 1/2 teaspoon kosher salt; 1/4 teaspoon ground black pepper; 1/4 teaspoon nutmeg; 1/4 cup feta cheese, crumbled; 1/2 cup whole milk ricotta cheese; 1/2 cup shredded whole milk mozzarella cheese; 1 egg; 2 cups shredded whole milk mozzarella cheese; 3 ounces cream cheese; 1 1/2 cups superfine blanched almond flour; 1 teaspoon psyllium husk powder