2 tablespoons E-Voo, plus more for brushing
1 small on one, chopped
1/2 pound white mushrooms, sliced
Kosher salt & pepper
6 cups baby spinach
6 slices potato bread, lightly toasted
6 large eggs
1/2 cup whole milk
3/4 cup shredded gruyere cheese
1. Heat the E-voo in a large skillet over medium-high heat. Add the onion and cook, stirring occasionally, until gold, about 8 minutes. Add the mushrooms and cook, undisturbed, until they begin to brown, about 2 minutes. Add 1/2 teaspoon salt, and pepper to taste; continue cooking, stirring occasionally, until soft, about 4 more minutes. Stir in the spinach and cook until wilted, about 2 minutes. Remove from the heat and let cool.
2. Brush a 9-by-13inch baking dish with olive oil. Arrange the bread in the dish in a singly layer with the edges slightly overlapping, then spoon the mushroom-spinach mixture on top. If making ahead, cover and refrigerate overnight.
3. When ready to bake, preheat the oven to 350. Crack an egg onto each piece of bread; season with salt and pepper. Pour the milk evenly over the top and sprinkle with the cheese. Bake until the egg whites are set, 25 to 30 minutes.
-Jason