Begin by either chopping or grinding the celery seeds to break them up slightly. You can achieve this by using a chef’s knife, crushing them gently with a mortar and pestle, or using a spice grinder. This step ensures that the seeds are evenly distributed throughout the mix, enhancing the flavor.

In a mixing bowl, combine all the ingredients together. This includes the dried minced onions, beef bouillon powder, onion powder, prepared celery seeds, granulated sugar, freshly ground pepper, paprika, garlic powder, and dried parsley. Stir well to ensure that all the ingredients are evenly incorporated.

Inspect the beef bouillon powder for any clumps. If you notice any clumps, use your fingers or a spoon to break them up, ensuring that the mix is smooth and free of any lumps. This step guarantees a consistent texture and flavor in the final product.

Once the mix is well combined, divide it into individual portions. You can use zipper-top bags, small jars, or airtight containers for storage.

Each portion should equal approximately one packet of the commercial mix, which is about 1 ounce or ¼ cup. Seal the bags or jars tightly to maintain freshness.

Place the portioned mix in a cupboard or another cool, dark place for storage. This will help preserve the flavor and shelf life of the mix. Avoid storing it in areas exposed to direct sunlight or heat, as this can degrade the quality of the ingredients over time.

When you're ready to use the mushroom onion soup mix, simply measure out the desired amount and add it to your recipes. It's perfect for making soups, dips, sauces, and seasoning meats or vegetables. Enjoy the convenience and homemade flavor of your custom mix!