In a large bowl, beat eggs and milk. Combine flour, cheese and salt; add to egg mixture and mix well. Cover and let stand at room temperature for 45 minutes.
Preheat oven to 450°. In a large skillet, cook bacon over medium heat until crisp. Using a slotted spoon, remove to paper towels to drain. Grease cups of a nonstick popover pan well with some of the bacon drippings; set aside. Stir bacon into batter; fill prepared cups two-thirds full.
Bake 15 minutes. Reduce heat to 350° (do not open oven door). Bake until deep golden brown, about 15 minutes longer (do not underbake).
Run a table knife or small metal spatula around edges of cups to loosen if necessary. Immediately remove popovers from pan; prick with a small sharp knife to allow steam to escape. Serve immediately.
Editor's Note: You may use greased muffin tins instead of a popover pan. Fill every other cup two-thirds full with batter to avoid crowding the popovers; fill remaining cups with water. Bake at 450° for 15 minutes and then at 350° for 10 minutes. Makes: 9 popovers.