When you make chocolate ganache without heavy cream and with milk, it's hard to even tell the difference!
To soften refrigerated ganache to a spreadable texture, let it sit at room temperature an hour or two before serving.
To make ganache smoother, add a splash of milk or cream and microwave on medium heat in 20 second intervals, stirring as needed.
If ganache becomes too liquefied, allow it to set up again at room temp or in the refrigerator. Or, reheat and add small amounts of chocolate chips, stirring as needed.