This Slow Cooker Pot Roast is the ultimate set-it-and-forget-it dinner. Tender, juicy beef is cooked low and slow with hearty vegetables and rich, savory flavors.
Add the tomato paste to the skillet and stir to coat the onions and garlic. Cook for 1–2 minutes to deepen the flavor. Stir in the tomato sauce, ranch seasoning mix, and au jus gravy mix.
Whisk 2 tbsp cornstarch with 2-3 Tbsp water in a small dish, then whisk into the saucepan. Bring to a simmer, stirring constantly, until the gravy has thickened.