Chocolate Coating
Heat the chocolate chips, butter, and light corn syrup in the microwave at 50% power for 2 minutes. Stir and continue heating at 50% power in 15-second intervals, stirring after each interval, until smooth.
Stir in the peppermint extract.
Spread ½ of chocolate coating in the bottom of a foil-lined 8-inch square pan. Place in the refrigerator to harden. Set the remaining chocolate aside.
Peppermint Patties Filling
Mix together the powdered sugar, 2 tablespoons of half-n-half, the melted coconut oil, corn syrup, peppermint extract, lemon juice, and vanilla.
Add 1-2 additional tablespoons of half-n-half, if the dough is too crumbly.
Remove the hardened chocolate in the pan from the refrigerator and press the filling into the pan
Top with the remaining ½ of the chocolate coating (re-melt in the microwave if needed). Sprinkle with crushed candy canes. Return to the refrigerator to harden.
Use the foil to lift the peppermint patties bars from the pan. Cut the bars into pieces. Store in an airtight container in the refrigerator.