Place the milk and cream in a saucepan over low heat. Heat until the milk is warm to the touch.
In a large bowl, whisk together the flour, salt and baking powder.
Crack the eggs into the bowl of an electric mixer fitted with the whisk attachment and beat for 3 minutes fluffy and light in color. Turn the mixer to low. Slowly add the milk and vanilla.
Gradually add the flour to the egg mixture and beat on medium speed for 1-2 minutes. Allow the batter to rest for 1 hour at room temperature.
Preheat the oven to 450 degrees.
Coat a popover pan or muffin tin with cooking spray and fill the popover cups almost to the top with batter. Place the popover pan on a baking sheet and transfer to the oven.
Bake the popovers for 15 minutes. Reduce the heat to 375 and bake for an additional 30-35 minutes until the popovers are a deep golden brown on the outside.
Remove the popovers from the pan and serve hot.
Video
Notes
Popover pans are available at kitchen supply stores.Popovers do not freeze well. They are best baked and enjoyed the same day.