In a skillet preheated with oil, sauté diced onions and mushrooms for about 15 minutes.
Add in the beef and sauté until it turns golden brown. Add in 2 cups of boiled water and 2 tbsp of Better Than Bouillon Beef Base. Cover the pot with a lid and let the beef simmer for about 2 hours. Season with salt and pepper.
In a seperate bowl whisk flour with 1/2 cup of cold water. Add in the flour mixture and stir to combine.
Add in the whipping cream and stir to combine. Let the mixture simmer for about 15 minutes, or until it has thickened into a gravy-like consistency.
Add in cooked pasta and let the stroganoff simmer for another 10 minutes. Note: If you're using fresh pasta, you don't need to precook it. Alternatively, you can serve the stroganoff over mashed potatoes or rice.