maybe bavarian creme. Which is kind of a mix of custard and whipped cream.
Would that be Chantilly ?( has texture like whipped Cream) 
Or it is a filling made from milk, flour, sugar, etc. Here is one recipe, I've seen many others, maybe on this site?
Cream filling
1/4 c. a.p. flour
1 c. milk
1 c. butter or marg., softened
1 t. vanilla extract
1/2 t. almond extract (opt)
1/4 t. salt
In a saucepan, combine flour and milk until smooth. Bring to boil over med. heat; cook for 1 min., stirring consistently. Mixture will thicken. Cool. Transfer to mixing bowl. Beat until smooth again and add butter, sugar, extracts, salt until light and fluffy, about 10 min.
Custard is used in cream puffs. I use this recipe for puff pastry bites that I made. They taste like cream horns but with a fraction of the work!
I've eaten cream puffs with custard too... but when I went to NY a couple years ago I bought this huge one and it had 'cream' that was really like frosting. I can't explain... it wasn't dairy or custard-ish, yet it didn't taste like buttercream either. I always wondered what it was. Guess I should have asked the bakery.
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