Warm the caramelized onion jam over medium high heat in a large pan.
1 cup caramelized onion jam
Once the jam is heated through, stir in mushrooms and water. Allow mushrooms to wilt, about 3-4 minutes. Add salt and pepper to taste.
3 oz white mushrooms, 3 oz portobello mushrooms, 1 - 2 tablespoons water
Remove from heat and set aside.
Line a baking sheet with a sheet of parchment paper.
Roll pie crust into a rectangular shape about 1/8" thick; transfer to baking sheet. Use a fork to pierce holes in the crust. (8 to 10 times is sufficient.)
1 single pie crust
Gently spread cream cheese over the pie crust, to within half and inch of the edges.
4 oz cream cheese
Top with mushroom and onion mixture.
Bake for 20-25 minutes, or until pie crust is cooked through and edges are golden brown.
Allow to cool to room temperature before cutting and serving.