Line a 9x9-inch pan with wax paper.
In a heavy saucepan, over medium heat, warm sweetened condensed milk. Let heat through. Add chocolate chips, stir until melted and well blended. Remove from heat, add vanilla. Pour into wax paper-lined pan. Refrigerate for at least one hour before cutting.
I found this really easy recipe on the back of a can of sweetened condensed milk when my kids were small. Now, I’m a grandma!!