We go once every few months to the Saturday/Sunday breakfast buffet. It's decidedly a self-service affair but the non-Cubans shouldn't stay away. For about $8 you get a crash course in Cuban and Latin American breakfast.
The buffet includes one glass of orange juice and cafe-con-leche (coffee with milk). Works like this: They will bring a cup of steamed milk. And a little metal container-full of freshly made Cuban coffee. You can then decide on the strength of your cafe-con-leche. If you need more milk, just ask for it. This is a Cuban breakfast staple; don't be surprised if your waitress asks if you want some for the kids. Just say no and ask for the hot chocolate instead for the kids. It's traditional, thick hot chocolate, not the watery stuff made from a powder.
The buffet includes rolls and breads. Skip those. You can get those anywhere. Instead, ask your server to bring you Cuban toast (at no charge). That's Cuban bread that has been sliced, buttered and then toasted and pressed. Use it to dunk in your cafe-con-leche. Or just eat it as is. Or make a sandwich out of the meats on the buffet.
There is always a big bowl of freshly cut mixed seasonal fruit in its own juice. This is my personal favorite. Depending on the season, you might get combinations of mango, apples, watermelon, grapes, peaches, melon, pears... whatever. There are fried eggs and usually two scrambled eggs, one plain and one with vegetables. There may be ham or chicken croquettes, fried chicken (a cross between KFC and chicken wings, cut small), thinly sliced honeyed ham, or sausages. There may be pancakes or waffles. And a few cold cereals. No yogurt. There is usually white rice, picadillo (seasoned ground beef) and some sort of stew to put over the rice. Or you can just put a fried egg on top of the rice.
There is always an assortment of pastelitos: puff pastry stuffed with gauva, or sweetened cream cheese, or seasoned ground beef, or coconut. They make an exceptionally moist yellow pound cake that is served in small squares - and sometimes will have a variation as a coffee cake. Don't miss out on the pastelitos and the pound cake.
If anything runs low at the buffet, just let your server know. They will either restock or bring the item specifically to your table.
The location in Miramar is bright and always clean, though sometimes the service can be spotty since they're not always checking on you during the buffet. Just flag anyone down and ask for your server, if you need them.