For something homemade, not the same as every day, but easy, you can make your own cream filled cupcakes and afterwards decorate them however you like.
First, I just used a cake mix to make cupcakes. Then I used a pastry bag and filled it with whipped topping. I stuck it right into the top of the cupcake and squeezed a little filling in. Cake mixes make such light cakes that there is plenty of room for the filling of your choice. Of course this left a white dot of cream on the top of the cupcake, but since I was decorating the top, that didn't matter.
Of course, it's hard to say exactly how much squeezing it takes to get the right amount of filling. Pay attention to the pressure created as you squeeze. Make a couple extra so you can slice one or two in half to see your results and then dispose of the evidence.
I did chocolate cake with whipped topping here, but think of all the fun you could have with this--strawberry cake mix with chocolate pudding filling, lemon cake with lemon pudding or pie filling, white cake with raspberry jam, yellow cake with custard, frosting inside the cupcake for a lunchbox treat that doesn't smear when wrapped . . .