Step 1

Place a sous vide cooker inside a large heat-proof container filled with water. Preheat the water bath to 179 degrees F (82 degrees C).

Step 2

Melt sugar in a small saucepan over medium heat until browned, about 5 minutes. Pour hot melted sugar into eight 4 ounce Mason jars, enough to cover the bottom of each.

Step 3

Mix sweetened condensed milk, evaporated milk, eggs, and vanilla extract together in a separate bowl. Add to the jars; seal.

Step 4

Place jars in the water bath and set timer for 1 hour.

Step 5

Remove jars from the water bath. Let flan cool until safe to handle, about 20 minutes.

Step 6

Unseal jars and run a small rubber spatula around the sides of the flan. Top each flan with a plate;invert and gently shake to release.