In a small bowl, mix together the spices until evenly combined.
If desired, ground the spices using a spice grinder (or a clean coffee bean grinder) until they become a powder. This will make the spice blend more like McCormick's Poultry Seasoning
Transfer the mixture to an airtight container and store the poultry seasoning in a cool, dark pantry or cabinet for up to 6 months.
Notes
Ground rosemary and ground thyme are different than dried rosemary leaves and dried thyme leaves. Be sure to note the difference in quantities. For the most flavorful spice blend, be sure your dried spices are no more than 6 months old. While certainly safe to use, they begin to lose flavor.