Preparation
Prep your veggies. Chop your potatoes into quarters, and your onions in about ½ in pieces. Leave the baby carrots whole. Slice your garlic cloves as thin as possible.
Add your tenderloin into your crock pot. Add your onion powder, garlic powder, parsley, thyme, salt, pepper, paprika and evenly distribute your rosemary around the tenderloin.
In a measuring cup measure out about 125ml of water. Add your brown gravy mix and mix thoroughly; Add in the rest of your water and throw that into your crock pot with the tenderloin and seasonings.
Add in the veg and combine everything well. Make sure to keep your tenderloin submerged in the broth.
Cook on low for 5 hours.
An hour before serving remove your tenderloin and turn your slow cooker to high to allow the veggies to get more tender.
While the veggies cook down more, grab 2 cups of the broth from the slow cooker. In a medium saucepan on medium heat add your bacon grease or butter, flour, and seasonings.
Once you see a roux start forming slowly add in the broth, continually stirring until the gravy begins to thicken, adjust according to your taste.
Heat a large skillet on high heat. Add in your neutral cooking oil. Once the oil begins to move around like water plop in your roast. We are going to give it a nice sear before serving. Give it 3-4 minutes on each side before allowing it to rest on a cutting board. Slice however you like.
Plate the meat and veggies, top with gravy and some extra broth from the slow cooker if you wish!
Enjoy!