Chill mixing bowls and beaters in the fridge for about 15 minutes.
In a medium bowl, beat the softened cream cheese with powdered sugar until smooth and creamy (about 2-3 minutes).
Add vanilla extract and sea salt; mix well.
In the chilled bowl, whip the heavy cream with an electric mixer on medium-high speed until soft peaks form (about 3-4 minutes).
Gradually add green food coloring and mint extract while whipping.
Stop whipping when cream holds its shape but remains light and airy.
Gently fold the cream cheese mixture into the whipped cream using a spatula with slow, sweeping motions to keep the mousse fluffy.
Fold in the mini chocolate chips evenly throughout the mousse.
Spoon the mousse into serving cups or ramekins, filling about 3/4 full.
Cover with plastic wrap and refrigerate for at least 2 hours or overnight for best texture.
Before serving, optionally garnish with fresh mint sprigs or extra chocolate chips.
Serve with crisp shortbread or ginger snaps.