Homemade Puff Pastry Method

In a large bowl, whisk together flour and salt.

Cut the cold butter into the flour using a pastry cutter (or two knives) until pea-sized pieces remain.

Slowly drizzle in ice water, mixing just until the dough comes together — it should be shaggy, not smooth.

Turn the dough onto a floured surface, shape into a rectangle, and roll out to about 10x15 inches.

Fold the dough into thirds (like a letter), then rotate and roll again. Repeat this “fold and roll” process 4–5 times, chilling the dough in the fridge for at least 30 minutes if it warms up.

Wrap tightly in plastic and refrigerate for 1 hour (or up to 2 days) before using.

Lightly Flour the Surface & Rolling Pin
Sprinkle flour on your work surface and rolling pin to prevent sticking. Keep a little extra flour nearby in case the dough gets tacky.

Work Quickly
Place the chilled dough on the floured surface and gently roll it into a rectangle about ⅛ to ¼ inch thick. Use even pressure, rolling from the center outward.

Rotate & Lift
Rotate the dough a quarter turn after every few rolls, lifting it gently to ensure it doesn’t stick to the counter. Add a dusting of flour underneath as needed.

Trim the Edges (optional)
For even puffing, use a sharp knife or pizza cutter to trim rough edges — clean cuts help the layers rise better.

Cut Into Sections
Once rolled, cut into the portions your recipe calls for (in your case, divide into four equal parts, then each into four smaller sections for 16 total squares).

Filling
Lightly spray the cups in a muffin pan and begin to place the smaller sections into the cups. Repeat step two and three until the muffin pan is full. 
Sprinkle a pinch of salt, pepper, and rosemary onto each of the sections in the cups, sprinkle tbsp. gruyere cheese into each cup in the middle of the pastry section. 
Use ½ tsp of cranberry sauce (or other jam) on top of the cheese and fold the four corners of the pastry into the middle and pinch the top.

Bake
Bake at 400 degrees for 10-12 minutes or until the pastry is puffed and golden brown. Plate warm, or at room temperature.