In a large skillet over medium heat, cook 1 pound of breakfast sausage, breaking it apart until browned (about 5–7 minutes). Once browned, sprinkle in flour and stir until absorbed. Gradually add 2 cups of milk while stirring constantly until the mixture thickens (around 3–5 minutes). Season with seasoned salt and black pepper to taste before setting aside to cool slightly.

In a separate skillet, crack 6 large eggs and whisk until fully blended, adding a pinch of salt and pepper. Cook over medium-low heat, stirring gently until the eggs are softly scrambled to your liking (about 3–4 minutes). Transfer to a plate and allow to cool near the sausage gravy.

In a mixing bowl, combine 2 cups of all-purpose flour and a pinch of salt. Add ½ cup of cold vegetable shortening and ½ cup of cold butter, cutting into the mixture until crumbly. Stir in 1 beaten egg, 1 tablespoon of vinegar, and 3–4 tablespoons of cold water until a dough forms. Gather into a ball, wrap in plastic, and refrigerate for 30 minutes.

Once chilled, divide the dough into two halves on a lightly floured surface. Roll each portion out to an ⅛-inch thickness. Use a pizza cutter or knife to slice the rolled dough into rectangles measuring 3x4 inches. Place half of the rectangles on a baking sheet lined with parchment paper for assembly.

For each pop-tart, brush the edges of the rectangles on the baking sheet with an egg wash (1 beaten egg). Add a tablespoon of cooled sausage gravy and a tablespoon of scrambled eggs onto the center of the rectangles. Cover each filled rectangle with another dough rectangle, pressing the edges together and crimping with a fork to seal tightly.

Preheat your oven to 375°F (190°C). Brush the tops of the assembled Savory Breakfast Pop-Tarts with egg wash and sprinkle with cheese if desired. Bake in the preheated oven for 25 minutes, or until golden brown.

Once baked, remove from the oven and let cool on a wire rack for 5 minutes. Store leftovers in an airtight container for up to 4 days, or freeze individually wrapped pop-tarts for later enjoyment.