greek yogurt chocolate cream pie cups

Name: greek yogurt chocolate cream pie cups
Ingredients: 2 tablespoons unsalted butter (or sub coconut oil); 3/4 cup graham cracker crumbs; kosher or flaky salt; 6 ounces bittersweet chocolate, finely chopped*; 3/4 cup milk (I used skim Fairlife for extra protein, I think any kind of milk will work!); 1 cup 2% greek yogurt (I used Fage; something thick like this is ideal); whipped cream (homemade or store-bought); mini chocolate chips