Cook Sausage: In a skillet over medium heat, brown the breakfast sausage until crispy and well-cooked, approximately 5-7 minutes.

Prepare Gravy: Sprinkle all-purpose flour over the cooked sausage and stir for about 1-2 minutes. Gradually whisk in whole milk and cook until thickened, about 3-5 minutes.

Scramble Eggs: In a separate skillet, crack eggs and cook until preferred doneness, about 3-5 minutes.

Make Dough: In a mixing bowl, combine flour and salt, cut in shortening and butter until resembling coarse crumbs; add egg, vinegar, and water, stirring until dough forms.

Roll & Cut Dough: Roll half of the dough to ⅛-inch thickness and cut into 3x4-inch rectangles, repeating with the other half.

Assemble Pop-Tarts: Lay half the dough rectangles on parchment, spoon filling into each, place remaining rectangles on top, and seal with a fork.

Bake: Preheat oven to 375°F and bake for about 25 minutes until golden brown.

Cool: Allow cooling on baking sheet for about 5 minutes before transferring to a wire rack.