I found the restaurants in Luang Prabang to be really outstanding. One of my favorites was L’Elephant. The Belmond La Residence Phou Vao had a really good restaurant with stunning views.
Other recommendations in recent articles include Tamarind Restaurant & Cooking School, Utopia, the restaurant at the 3 Nagas, Restaurant le Tangor and Saffron for coffee.
I recently read about La Belle Rive for dining along the Mekong River, Manda de Laos for fine dining in a beautiful setting on a lilly pond, Chez Matt for wine and cocktails, Le Banneton Café for French-style baguettes, pastries, and coffee and the casual Le Bistro Ban Vat Sene. It is ideal for breakfast, lunch, a tea break, dinner or just for cocktails.