Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_909 ( "No. in series" text, "No. in season" text, "Title" text, "Directed by" text, "Written by" text, "Storyboarded by" text, "Original air date" text, "Production code" text )

### Question ###
How many episodes have been directed and written by Darrick Bachman and Brett Varon?

### Accurate SQL ###

SELECT COUNT("Directed by") FROM table_909 WHERE "Written by" = 'Darrick Bachman and Brett Varon'