Prep apples – Peel, core, and dice the apples into small chunks.
Cook apples – In a saucepan over medium heat, add apples, sugar, brown sugar, water, lemon juice, cinnamon, and salt. Stir to combine.
Simmer – Cook uncovered for 15–20 minutes, stirring occasionally, until apples are very soft.
Mash or blend – Use a potato masher for a rustic texture, or an immersion blender for a smooth jam.
Jar it – Spoon jam into a clean small jelly jar. Let cool completely.
Store – Refrigerate up to 1 week, or freeze up to 2 months. To use from freezer, thaw overnight in the fridge.