01 -
Line the bottom and sides of a 6 to 8-quart slow cooker with a large piece of foil. Spray the foil with nonstick cooking spray.
02 -
In a large bowl, whisk together milk, beaten eggs, sugar, one packet each of au jus gravy mix and ranch seasoning mix, and breadcrumbs until fully combined.
03 -
Add ground beef to the bowl and mix gently until just combined, avoiding overmixing to maintain tenderness. Use clean hands for best results.
04 -
Transfer the meat mixture into the slow cooker and shape it into an oval loaf.
05 -
In a separate bowl, whisk together cold water, peperoncini juice, and the remaining packets of au jus gravy mix and ranch seasoning until smooth.
06 -
Pour the prepared gravy evenly over the meatloaf and around the sides. Arrange peperoncini peppers on top.
07 -
Cover and cook on low for 5 to 6 hours or on high for 3 to 4 hours until the internal temperature reaches 165°F (74°C).
08 -
Carefully lift the meatloaf out using two spatulas or by lifting the foil edges, noting that gravy may add slipperiness.
09 -
Strain the cooking liquid into a medium saucepan and heat over medium heat until simmering.
10 -
In a small bowl, whisk together cornstarch and water until smooth. Gradually whisk the slurry into the simmering gravy and cook for 1 minute until thickened. Remove from heat.
11 -
Slice the meatloaf and spoon the thickened gravy over each portion before serving.