Beat milk and eggs until smooth. Whisk together flour, sugar and salt. Pour wet ingredients over dry and stir just until combined.
Heat a skillet over medium-high heat. Melt butter. Pour in batter. Let cook, undisturbed, until the bottom is beginning to brown, about 4 minutes. Using a spatula, flip the batter in sections, scrambling it. Allow to cook again until it begins to brown, 3-4 minutes. Repeat 3-5 times, until all the batter is in scrambled curds and has browned. Dust with powdered sugar and serve with fruit preserves.