Can this be made in under 30 minutes?

Yes, the recipe is designed to be quick and efficient.

Does it work for meal prep?

Most versions store well for one to three days.

Yes, simple swaps can be made for convenience or dietary needs.

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Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a large bowl, cream together butter and confectioners sugar until light and fluffy. Mix in vanilla extract.
In a separate bowl, whisk flour and salt. Gradually add to the butter mixture until just combined.
Form dough into a disk, wrap in plastic, and chill for 30 minutes.
Roll out dough to 1/4-inch thickness, cut into rounds, and place on baking sheet.
Bake for 10–12 minutes, or until edges are barely golden. Cool completely on a wire rack.
Simmer unopened can of sweetened condensed milk in water for 2–3 hours, fully submerged. Cool before opening.
Stir in a pinch of kosher salt to the caramel, then spread or pipe onto half the cookies and top with remaining cookies.

Chill the dough well for easier rolling. Use room temperature butter for a tender crumb. Ensure water level is maintained when simmering the can.