makes about 1 standard-size spice jar's worth

1 tbsp chili powder
1.5 tsp cumin
1 tsp black pepper
.5 tsp paprika
.5 tsp onion powder
.25 tsp garlic powder
.25 tsp red pepper flakes
.25 tsp oregano or italian seasoning
.25 tsp cayenne

if you have any of the above items in whole dry form, you can use a coffee grinder to blend them. 
mix and store in your old taco seasoning spice jar, or another sealed jar. keeps for a few years. 

store-bought taco seasoning often includes salt so make sure to add the amount of salt you want to your recipe when you cook!