Slice the strawberries down the middle, cut off the small bump at the back, and scoop some out from the center. Then, simply add whipped cream or buttercream frosting.
To stay true to the deviled egg inspiration, use the pieces of fruit that you cut out from the strawberries to fill them back up. You could even freeze-dry them.
If you're making the treats ahead of time, place them in an airtight container and store them in the fridge for up to a few hours for the freshest results.