Preheat oven to 400°F (200°C). Line a baking sheet with parchment paper.
Cook the beef sausage in a skillet over medium heat until browned and fully cooked. Drain excess grease and let cool slightly.
In a bowl, whisk 5 eggs with salt, pepper, and milk or cream if using.
Scramble eggs in a lightly greased skillet over medium-low heat until just set and still slightly glossy. Remove from heat.
Lightly flour your surface and unfold puff pastry sheets. Roll gently to smooth creases and cut each sheet into 4 rectangles for a total of 8.
Place 4 pastry rectangles onto the prepared baking sheet. Spread about 1 tablespoon of sauce in the center of each.
Divide scrambled eggs evenly over each pastry base. Top with beef sausage and shredded cheese.
Beat the remaining egg with 1 teaspoon water to make an egg wash. Brush pastry borders lightly.
Place remaining pastry rectangles on top. Press edges together and crimp with a fork to seal.
Brush tops with egg wash and cut small slits for steam vents. Sprinkle with Everything Bagel seasoning if desired.
Bake the 5 Ingredient Breakfast Hand Pies for 18–22 minutes until puffed and deep golden brown.
Cool for 5–10 minutes before serving.