In a large non-stick skillet, melt butter and stir in sugar. As mixture begins to bubble, remove from heat and spread out pears. Return skillet to heat and cook over medium high until golden brown syrup bubbles up. This process will take about 30 minutes. Roll out crust to flatten folds and sprinkle with cinnamon sugar mixture. Place crust over pears and press down around edges. Cut slits in crust and brush with egg. Bake for 30 minutes until crust is golden brown. Allow skillet to cool for 2 minutes. Loosen edges of crust with paring knife. Invert tart onto plate and cool.