Chop the onion.
Using a food processor finely mince the mushrooms.
In a skillet over medium heat, melt the butter and olive oil together. Add the onions and 1 tsp of salt to the skillet. Cover the pan and cook over medium-low heat. Cook covered for about 10 minutes, stir about halfway through the cook time.
Mix 1 tsp of beef and 1 tsp of chicken bouillon into the hot water.
Remove the lid and add the mushrooms. Continue to cook until the mushrooms are heated through about 1-2 minutes, stirring occasionally. Add ¼ cup of flour to the mushrooms and mix well.
Stir in the broth mixture and heavy cream. Season to taste with salt and fresh cracked black pepper, Cajun seasoning is optional.
Transfer to the slow cooker and add the stew meat. Mix thoroughly. Cover and cook on low for 6-8 hours until meat is tender. Serve over rice.