Step 1: Preheat the Oven - Preheat your oven to 375°F (190°C). This step is crucial for ensuring that your bake cooks evenly.
Step 2: Prepare the Potatoes - In a medium pot, bring salted water to a boil. Add the diced red potatoes and cook until they are tender, about 10-15 minutes. Drain and set aside.
Step 3: Sauté the Spinach - In a skillet, melt the butter over medium heat. Add the chopped spinach and cook until wilted, about 2-3 minutes.
Step 4: Whisk Together the Eggs - In a large mixing bowl, crack the eggs and beat them. Add the cottage cheese, remaining salt, onion powder, distilled vinegar, hot sauce, and Dijon mustard. Whisk until smooth.
Step 5: Combine the Ingredients - Add the cooked potatoes, sautéed spinach, Gruyère, Monterey Jack, and white cheddar to the egg mixture. Stir gently until well incorporated.
Step 6: Transfer to Baking Dish - Pour the mixture into a greased 9x13 inch baking dish. Spread it out evenly.
Step 7: Top with Cheddar and Chives - Sprinkle the shredded cheddar and chopped chives over the top.
Step 8: Bake - Bake in the preheated oven for about 30-35 minutes, or until the center is set and the top is golden. Allow to cool before slicing.