Cream Puffs!

I originally considered making a whole croquembouche for my parents' anniversary, but then decided it'd be too hard to move and whatnot, so ended up just making the cream puffs instead. I also brought some to a BBQ with old friends, where it was very welcome. :) I like a richer filling than normal whipped cream, so I tried a cheese filling instead, and I gotta say, it worked out OK. After one bite, one of my friends declared I should start all dates by feeding the guy one of these.

Puffs
Ingredients
1 cup water
1 stick unsalted butter
1/2 Tbsp sugar
dash of salt
1 cup flour
4 eggs

1. Preheat oven to 425F. Over high heat, bring water, butter, sugar, and salt to a boil. Turn off heat and mix in the flour; it should pull away from the edges of the pot into a ball of dough. Wait a few minutes for it to cool slightly, then add one egg at a time, mixing to incorporate the whole egg before adding the next. The batter should be thick, but thin enough to slowly fall from a wooden spoon - add another egg if it's still too thick.
2. Transfer the batter to a pastry bag fitted with a large, plain tip. Pipe 1" round, 1/2" high disks onto a foil or wax paper lined baking sheet, leaving some space in between each dollop. With a wet finger, knock down the tip of each dollop. Bake at 425F for 15min until puffy, then drop the temperature to 375F for another 10-15min, until golden brown.
3. Peel the puffs off the foil immediately; once the foil cools, it'll be hard to peel them off without peeling the bottom off the puff.

Filling
Ingredients
2/3 cup mascarpone
2/3 cup ricotta
3 Tbsp sugar (more to taste)
1 tsp vanilla extract

Mix ingredients together. I couldn't figure out a way to pipe it into the puffs, so just slice the puffs halfway in the center and spoon a dollop of the filling inside, then close.