Blend the milk, egg, spinach, chives, flour, baking powder, 1/2 teaspoon kosher salt and a few grinds of black pepper in a blender on medium-high, scraping down sides occasionally, until completely mixed and bright green. Transfer to a bowl and stir in the cheese.
Heat a large nonstick skillet over medium heat and add about 1 teaspoon of butter to the pan, heat through until foaming subsides. Ladle about 1/4 cup of the batter onto the skillet; use the back of your ladle or a spoon to spread it slightly. Pour 1 or 2 more pancakes, taking care to keep them evenly spaced apart. Cook until the top is set and starting to bubble, and the undersides are browned and crisp at the edges, 2 to 3 minutes. Flip with a spatula and cook another 2 minutes on the second side adjusting the heat if the cakes are browning before the cakes fully set. Serve immediately or transfer to a platter and cover loosely with foil to keep warm. Repeat with the remaining batter, adding more butter to the skillet as needed, you should have 8 to 10 pancakes.
To serve pancakes, transfer 2 pancakes to each plate, top with 1/2 cup corned beef hash, a fried egg and a sprinkling of chives.
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