No. They may still taste great, but they will not be the cookies that were intended in this recipe. If you omit the instant espresso/coffee and the espresso chips, you basically have brown butter chocolate chip cookies. Still delicious! But not the same. If you decide to skip browning the butter, and just use softened room temperature butter, you also will have a completely different cookie. Again: it will likely taste great! But, it will not be the same cookie.