Step by Step method

1. Step 1.

   Preheat oven to 425 degrees F (220 degrees C).

2. Step 2.

   Spray a popover pan with nonstick cooking spray.

3. Step 3.

   Place pan on center rack of oven and preheat for 2 minutes.

4. Step 4.

   Blend flour, salt, eggs, milk, and melted butter until it looks like heavy cream, about 1 to 2 minutes.

5. Step 5.

   Cut chilled butter into 6 even pieces.

6. Step 6.

   Place 1 piece of butter in each cup and place pan back in oven until butter is bubbly (about 1 minute).

7. Step 7.

   Fill each cup half full with batter and bake 20 minutes.

8. Step 8.

   Reduce heat to 325 degrees F (165 degrees C) and bake for another 15 to 20 minutes.