Biscuits and Gravy

Name: Biscuits and Gravy
Ingredients: 400g cake flour; 400g all-purpose flour; 10g salt; 8g baking soda; 36g baking powder; 450 grams unsalted butter, cubed and chilled; 480 grams full-fat buttermilk; 2 large eggs, whisked with 1⁄4 tsp salt for egg wash; 5 tbsp grapeseed oil; 1.5 lb ground sausage meat; Salt, black pepper, and Aleppo pepper to taste; 3 tbsp all-purpose flour; 5 cups milk, depending on pan size; Minced sage and **[1 tbsp]** thyme sprig to taste, optional; **[1 tbsp maple syrup]**