Preheat the oven to 375 degrees and line a large baking sheet with parchment paper.
Lightly flour the countertop and the rolling pin, roll the galette dough out until it's 1/4" thick, measure and cut out two 7" circles. Place them on the parchment-lined baking sheet. Gather up the leftover dough into a ball, roll it out again and cut two more 7" circles, also placing them on the baking sheet.
On each galette circle, start by adding a scant 1/4 cup of cream cheese béchamel sauce and smooth it around leaving 1/2" of space around the edges. Next, add 1/3 cup of breakfast sausage, and 1/4 cup of sliced tomatoes. Sprinkle with chives. After this, carefully crack an egg over the center of the galette, season the egg with salt, pepper, and paprika.
Gently fold the 1/2" edges of the galette dough up around the filling. Mix an egg with 1 tbsp of water and egg wash the crust.
Place the baking sheet on the middle rack of the oven and bake for 25-35 minutes. The galettes are finished when the crust is lightly browned and the egg is cooked to your liking!
Remove from the oven, plate, sprinkle with fresh parsley and serve immediately! Enjoy!