Place all of the ingredients, except for the corn starch slurry, in a sauce pan on the stove on medium-high. Stir everything together until the mixture begins to boil.
Once the mixture is boiling, add in the corn starch mixture.
Turn down the heat and keep cooking and stirring. The berries will begin to disintegrate and the mixture will thicken a bit. Cook the compote on medium low for about 10-15 minutes, stirring every so often. Keep the compote on low until you are ready to serve.
Recipe by Confident Cook, Hesitant Baker at https://confident-cook.com/2013/05/compoteamdchocolatecroutons.html