01 -
Line a 6 or 8 quart slow cooker with a large piece of foil, ensuring it extends up the sides. Spray the foil with nonstick cooking spray.
02 -
In a large bowl, whisk together milk, eggs, sugar, 1 packet of au jus gravy mix, 1 packet of ranch seasoning mix, and breadcrumbs until thoroughly combined.
03 -
Add ground beef to the bowl with the wet ingredients. Mix gently until just combined, being careful not to overmix to maintain tenderness. Clean hands work best for this step.
04 -
Transfer the meat mixture to the prepared slow cooker and shape it into an oval loaf.
05 -
In a separate bowl, whisk together the cold water, peperoncini juice (if using), remaining au jus gravy packet and remaining ranch seasoning packet until well combined.
06 -
Pour the gravy mixture over and around the shaped meatloaf.
07 -
Place peperoncini peppers on top of the meatloaf if using.
08 -
Cover and cook on low for 5-6 hours or on high for 3-4 hours, until the internal temperature reaches 165°F.
09 -
Carefully transfer the cooked meatloaf to a serving platter using two spatulas or by lifting the foil edges.
10 -
Strain the cooking liquid from the slow cooker into a medium saucepan and bring to a simmer over medium heat.
11 -
In a small bowl, whisk together cornstarch and water to create a smooth slurry.
12 -
Once the gravy simmers, slowly pour in the cornstarch slurry while whisking continuously. Simmer for 1 minute until thickened, then remove from heat.
13 -
Slice the meatloaf and serve with the thickened gravy poured over each portion.