If your instant pudding made with almond milk is not setting properly, there are a few ways you can try to thicken it:
Add more instant pudding mix: One straightforward solution is to try adding more instant pudding mix to the mixture. This should help increase the thickening agent and improve the setting consistency. Prepare a small amount of additional pudding mix according to the package instructions, and gradually whisk it into the existing mixture until you reach the desired thickness.
Use cornstarch: Cornstarch is a common thickening agent that you can use to help set the pudding. In a separate bowl, mix 1 to 2 tablespoons of cornstarch with a small amount of almond milk to form a slurry. Add the slurry to the pudding mixture and gently heat it over medium-low heat on the stove, stirring continuously until it thickens.
Heat and cook longer: If the pudding hasn't been heated yet, you can try gently heating it on the stove over medium-low heat. Stir continuously until the mixture thickens to the desired consistency.
Refrigerate for longer: Sometimes, pudding takes time to set properly, especially when using alternative milk like almond milk. Place the pie in the refrigerator for an extended period (2-4 hours or overnight) to see if it thickens with time.
Use gelatin: If you have unflavored gelatin on hand, you can try adding it to the pudding mixture. Dissolve the gelatin in a small amount of warm water, following the package instructions, and then stir it into the pudding mixture.
Instant pudding mix with modified starch: Check if the instant pudding mix you used contains modified starch as one of its ingredients. If it does, using a non-dairy milk like almond milk might not give the same results as regular dairy milk.
Remember that the exact amount of additional thickening agent required may vary depending on the quantity of pudding and the brand of instant pudding mix you are using. It's best to make small adjustments gradually until you achieve the desired consistency.
If you prefer not to use the thickened pudding for pie filling, you can also serve it as a delicious pudding dessert in individual bowls.