Siman 165
Presented here for study, not as a practical ruling. The Shulchan Aruch rules by Sephardi custom, the Rema's glosses by Ashkenazi custom, and the Kitzur follows Ashkenazi custom. For a practical question, ask your rabbi.
א הָעוֹשֶׂה צְרָכָיו וְרוֹצֶה לֶאֱכֹל, יִטֹּל ב' פְּעָמִים. עַל הָרִאשׁוֹנָה מְבָרֵךְ: אֲשֶׁר יָצַר, וְעַל הַשְּׁנִיָּה מְבָרֵךְ: עַל נְטִילַת יָדָיִם. וְאִם אֵינוֹ רוֹצֶה לִטֹּל אֶלָּא פַּעַם אַחַת, לְאַחַר שֶׁשָּׁפַךְ פַּעַם אַחַת עַל יָדָיו וּמְשַׁפְשֵׁף, יְבָרֵךְ: אֲשֶׁר יָצַר, וְאַחַר כָּךְ בִּשְׁעַת נִגּוּב יְבָרֵךְ: עַל נְטִילַת יָדַיִם.
1 One who defecates and subsequently wants to eat should wash his hands twice, and say Asher Yatzar on the first washing and Al Netilat Yadayim on the second washing. And if one only wants to wash his hands once, after he washes he should say the blessing of Asher Yatzar, and afterward at the time he dries [his hands] he should say the blessing of Al Netilat Yadayim.
ב אִם רַבִּים מְסֻבִּין בִּסְעֻדָּה, הַגָּדוֹל נוֹטֵל יָדָיו תְּחִלָּה; וְהָרֹא"שׁ הָיָה רָגִיל לִטֹּל בָּאַחֲרוֹנָה, שֶׁלֹּא לְהַפְסִיק וְשֶׁלֹּא לְדַבֵּר.
2 If many people are at a meal, the most important one should wash first. And the Rosh was careful to wash last in order that he should not have a pause, and he should not speak [between washing and eating bread].