1Place chocolate chips and butter in a saucepan over medium-low heat; stir until melted and smooth, about 5 minutes. Remove from heat to cool slightly.
2Whisk vanilla wafer crumbs, confectioner's sugar, pecans, cocoa powder, and almonds together in a large bowl; stir in Irish cream liqueur, sour cream, and chocolate mixture to form a soft dough. Cover mixture with plastic wrap and refrigerate overnight.
3Form mixture into 1/2 tablespoon balls with a small scoop; place on a baking sheet. Place baking sheet in freezer until firm, about 30 minutes.
4Melt dark chocolate in a microwave-safe glass or ceramic bowl in 30-second intervals, stirring after each melting, for 1 to 3 minutes (depending on your microwave). Do not overheat or chocolate will scorch. Using a toothpick, dip each ball into melted chocolate to coat; place on waxed paper until chocolate is firm, about 10 minutes.
5Place balls in candy cups; store in an airtight container in the refrigerator for up to 6 weeks.
Footnotes
Cook's Notes:
If mixture is too wet, add vanilla wafer crumbs a few tablespoons at a time; if too dry, add more Irish cream liqueur a tablespoon at a time.
Often I will freeze the undipped balls in an airtight container and just dip as many as I need.