Heat oven to 375°F.
Line a sheet pan with parchment paper. Set aside.
Sift flour. Set aside.
Place milk, water, salt, sugar, and butter in a medium saucepan.
Bring to a boil.
Remove from heat.
Stir in flour.
Return to heat.
Cook, stirring constantly, until it cleans the side of the pot, about 1 minute.
Transfer to stand mixer fitted with the paddle attachment.
Beat in eggs, one at a time, until smooth and glossy.
Spoon into a piping bag.
Snip bottom to form 1 inch opening.
Pipe 1 inch rounds onto prepared pan.
Tap peaks down with water damp finger.
Bake for 10 minutes.
Reduce heat to 350°F.
Bake for an additional 15-20 minutes, until pastry is golden brown and dry in the center.