i think if you do a search on chowhound or even google you will find that you can find the answers very quickly just in case no one responds immediately i googled port chester ethnic bakery and came up with the following links which you can bookmark for the future kneaded bread has pretty good coffee and i think they also serve espresso drinks
Asi es Colombia is a (surprise) colombian bakery. On Main.
Kneaded Bread is there. Not ethnic, but awesome. Was there this morning (as all Saturdays).
Panaderia Uruguaya on Westchester Avenue is good early. They don't bake on premises, so by the late afternoon it doesn't taste as fresh.
La Flor Bakery, across from Panaderia Uruguaya, is a mexican bakery with good tres leche cake.
I've tried all of these many times. There are others too... I just can't remember off hand.
I don't drink coffee, so I can't help you with that at all. Sorry...
oh, here are the addresses:
ASI Es Colombia Bakery Restaurant
174 N Main St, Port Chester, NY 10573
181 N Main St, Port Chester, NY 10573
Panaderia Uruguaya Las Gemelas
204 Westchester Ave, Port Chester, NY 10573
La Flor De Jalisco Bakery
217 Westchester Ave, Port Chester, NY