Preheat oven to 400°. Drop a piece of butter in each cup of a popover tin or muffin tin. Place pan on a baking sheet.
In a small bowl, beat eggs until pale. Add milk; stir to combine. In a medium bowl, whisk together flour, flaxmeal, and salt. Add milk mixture to flour mixture and whisk until almost smooth.
Place popover tin and baking sheet in the oven for 3 minutes. Remove tin from oven and evenly divide batter between cups. Drop a teaspoon of strawberry cream cheese into each cup of batter. Bake for 30 minutes or until popovers are puffy, with brown crusts and hollow centers. Serve immediately.