Creating your own 3-Ingredient Slow Cooker Sweetened Condensed Milk is straightforward. Follow these steps to make this creamy delight:

1. Combine Ingredients: In your slow cooker, mix the whole milk, granulated sugar, and unsalted butter.
2. Set the Heat: Turn your slow cooker to low heat to allow the mixture to start melting.
3. Stir Occasionally: Every 30 minutes, stir the mixture well to ensure the sugar dissolves completely and to prevent it from burning.
4. Cook: Let it cook on low for about 2-3 hours. Check for thickness—the mixture should look creamy and slightly thickened.
5. Cool Down: Once done, turn off the slow cooker and let it cool on the counter for about an hour before transferring.
6. Store: Pour the cooled sweetened condensed milk into a clean jar or an airtight container.
7. Refrigerate: Store in the refrigerator for up to two weeks.

Following these steps will provide you with thick, creamy sweetened condensed milk that you can use in countless ways!