Yes, there is a thing called transparent pie. I have found it to be extremely regional: southeastern Ohio/Maysville KY area. Nevertheless, here’s the recipe:
This is a regional favorite that might not be appreciated by everyone.
3 whole eggs, beaten 2 c sugar
2 T flour
2 tsp vanilla
1 stick margarine or butter
1/2 c milk
Add sugar and flour to beaten egg. Beat well.
Add vanilla, butter, and milk. Mix well.
Pour into pie shell and bake at 400 degrees for 10 min.
Reduce temperature to 350 degrees for 25 minutes or until pie is firm around edges.
Just ask George Clooney: