Slice the bread thinly and spread out in one layer on baking sheets (you will need more that one baking sheet).
Toast bread for 5 minutes then flip bread slices over. Toast for another 5 minutes until dry throughout. Heavy breads may take longer to toast.
Transfer toasted bread to a wire rack until cool.
Break up the bread and crush in the food processor in several batches progressively transferring crumbs to a medium bowl.
With the last lot of crumbs in the food processor add the parsley and process for 20-30 seconds until the parsley is finely chopped.
Combine all the crumbs in a bowl together with remaining ingredients.
Store in an airtight container or heavy duty zip lock bag in the fridge for two weeks or in the freezer for 3 months.
Notes
Variations
If you are in a hurry, you can use plain, dry, store-bought bread crumbs and add the seasonings to make this recipe in 5 minutes.
Increase or decrease the spices to your taste.
Add finely grated Parmigiano Reggiano (Parmesan) or Pecorino Romano cheese.
Tips for Success
The bread must be dry, or it will tear and not crumble in the food processor. Different breads will need different drying times. I use a French stick, which dries easily. However, heavier breads will take longer to dry in the oven.
Be sure to slice the bread thinly so that it dries quickly.