Preparation Preheat oven to 275°F. Line large rimmed baking sheet with parchment. Combine milk powder, flour, sugar, cornstarch, and coarse salt in medium bowl; toss to mix evenly. Add butter; stir with fork until clusters form. Spread mixture evenly on prepared sheet. Bake until crumbs are dry and crumbly but still pale, about 10 minutes. Cool Milk Crumbs completely on sheet. DO AHEAD: Can be made 1 week ahead. Store in airtight container at room temperature.
Preparation Preheat oven to 275°F. Line large rimmed baking sheet with parchment. Combine milk powder, flour, sugar, cornstarch, and coarse salt in medium bowl; toss to mix evenly. Add butter; stir with fork until clusters form. Spread mixture evenly on prepared sheet. Bake until crumbs are dry and crumbly but still pale, about 10 minutes. Cool Milk Crumbs completely on sheet. DO AHEAD: Can be made 1 week ahead. Store in airtight container at room temperature.