Season all surfaces of the roast with the garlic salt & black pepper, then set to the side.
Drizzle the vegetable oil into a large pan, then place the pan over medium heat.
Once the vegetable oil is nice and hot add in the roast followed by the rosemary, thyme, onions, and garlic.
Be sure to sear all sides of the roast.
Once the roast is nicely seared, place it into a 4-6 qt slow cooker. Also be sure to add in the herbs, onions, and garlic.
Now sprinkle in the onion soup mix, and pour in 3 cups chicken broth. Also add the browning seasoning at this time.
Turn the slow cooker on high and let cook for 6 hours.
During the last hour of cooking, add 2 tbsp of heavy cream, and 2 tbsp of all purpose flour.
Mix everything well, then place the lid back on the slow cooker.
Once the roast is done serve and enjoy with mashed potatoes, pasta, or rice.