Zhèxiē bǐnggān dōu shì wǒ zuò de.
These cookies were all made by me.
这些饼干都是我装饰的。
Zhèxiē bǐnggān dōu shì wǒ zhuāngshì de.
These cookies were all decorated by me.
这些 (zhèxiē): These
饼干 (bǐnggān): Cookies
都是 (dōu shì): All are
我 (wǒ): I/me
做的 (zuò de): Made by
装饰的 (zhuāngshì de): Decorated byThe structure emphasizes personal involvement.