Line a muffin tin with cupcake liners. In a microwave safe bowl, melt chocolate chips and coconut oil together in 30 second intervals. Let cool 5 minutes.
Spoon about 1½ tablespoons of melted chocolate into each liner. Gently tilt muffin tin to coat the bottom and sides of liners, going ⅔ up the sides. Refrigerate until hardened, 1 hour.
Meanwhile, make filling: In a microwave safe bowl, melt chocolate chips in 30 second intervals. Let cool slightly.
In a medium bowl using a hand mixer, beat heavy cream and powdered sugar to stiff peaks. Add about 2 tablespoons of cooled melted chocolate and continue to beat until incorporated. Add remaining melted chocolate and fold in until just combined. Refrigerate 1 hour.
Carefully unwrap chocolate cups from liners. Place mousse into a piping bag fitted with an open star tip and pipe into cups. Garnish with a strawberry slice and refrigerate until ready to serve.
Recipe by The Best Video Recipes for All at https://recipes-for-all.com/strawberry-chocolate-mousse-cups/