This baked dish is a great alternative to individual omelets any time

Grease a 9”x13” oven-to-table dish. Position a rack in top third of oven; preheat to 350 degrees F.
Beat eggs, milk, 1 1/2 teaspoon salt, and 3/4 teaspoon pepper in a large bowl; set aside.
Melt 1 tablespoon butter in a large skillet over medium heat. Add leeks to skillet.
Season with salt; cook until wilted, about 5 Minutes. Transfer to a small bowl.
Melt 3 tablespoons butter in same skillet over medium heat.
Add potatoes, spreading out in an even layer. Cook potatoes, stirring occasionally, until edges are crisp and golden brown, about 10 Minutes.
Slide potato shreds into greased pan. Scatter spinach and leeks over potato pancake, each in an even layer.
Season with salt and pepper, and then pour in egg mixture. Sprinkle both cheeses over the top.
Bake until casserole is puffed and golden brown, 35 Minutes to 40 Minutes. Serve warm or at room temperature.

Hi! I want to make this. What can I substitute the leeks with?
You can use onions, preferably Vidalia as a substitute.
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