Crema de leche is the Colombian cooking cream, closest to heavy cream but lighter. This makes it at home from milk and butter: blended warm, then chilled until it sets. There are two methods below and they are alternatives, not steps: the first needs an overnight chill, the second thickens on the stove with cornstarch.
For a quicker version of Method 1, reduce the butter to one tablespoon and add 2 tablespoons of cornstarch, then heat and stir constantly until it thickens. Whichever method you use, the cream keeps about four days refrigerated.