Hello Everybody!! Here is my tutorial on how to make a lemon filled pâte à choux! 
If you need to make some lemon curd, 
Here's how: https://youtu.be/yu3dGO0yLEg 

Ingredients for choux pastry: 
1/4 cup butter (1/2 stick)
2/3 cup water
1/2 cup AP flour
2 eggs

1T of water

Other stuff: 
Piping bag (I use this one) and tip (This is a GREAT/CHEAP starter kit!)
pan and implement for stirring
2 pans lined with parchment paper or a silpat, I have this one
sharp knife

Preheat oven to 425degF
Melt butter and then add water.
Bring to a boil. 
Remove from heat and add in flour
Add eggs one at a time incorporating vigorously as to not to cook the eggs
Place mixture in piping bag
Pipe out the dough onto lined baking sheets
with wet finger get rid of the "kiss" on the top from the piping bag

Put in oven and turn down the temp down to 400degF
bake for about 25-30 minutes until golden brown

Remove from oven and poke a hole with knife in the side of the pastries to allow any steam to escape.
Cool completely before making filling. 

1 Cup heavy whipping cream
2 1/4 T of sugar
1/2 t  vanilla extract
c. 2 T lemon curd (if you haven't made mine, store bought is fine) ;) 

Place bowl and whisk attachment in the freezer for about 20 minutes. 
Add ingredients into the bowl and whip for about 4 minutes then add in curd. (this is totally optional. . . )
Put whipped cream into piping bag and find the slit in each pastry. 
Pipe in the whipped cream. 

Et Voila! Cream filled puffs WAY better than store bought! 

If you can't eat all at once ;), you can freeze these for a couple months. Just pull out about an hour before you're ready to eat!