1-2 tablespoons(optional) honey, maple syrup - see note
Add fruit to a saucepan and cook over medium heat until the fruit breaks down, about 5 to 10 minutes. Using a potato masher or the back of a fork, mash the mangoes to desired consistency. I like to keep it a bit lumpy.
Remove from heat. and stir in the chia seeds. Let it sit to thicken. If you want it thicker, add more chia seeds (½ - 1 teaspoon at a time).
Once cooled, transfer to a jar and keep in the fridge for up to 2 weeks or in the freezer for up to 3 months.
If you desire a smooth consistency, simply puree the mixture in a blender. You can also skip the cooking part and blend the mangoes before combining with the chia seeds. The jam won't be as thick but will still be good! I recommend avoiding added sugars until 2 years of age, but if you want to make the jam sweeter, remember, NO honey for babies under 1!