Place rice in a 6-inch-deep (3- or 4-quart) pan. Cover with very hot tap water and stir vigorously "to clean and soften rice." Drain rice in a colander. Repeat twice with fresh hot water to clean and soften rice adequately.
In mixing bowl, add 1 quart very hot tap water to chicken base. Mix well with a wire whisk.
Add dissolved chicken base mixture to soaked rice; stir well. Place rice, uncovered, in 350-degree oven 15 minutes. Melt butter in a microwave-safe container. Remove rice from oven and add butter to rice; mix thoroughly. Cover rice and return to 350-degree oven 15 minutes. Meanwhile, combine bell peppers in mixing bowl and cover with very hot tap water. Set aside to soften. Remove rice from oven. Drain water; rinse softened peppers thoroughly with hot water. Add peppers to rice; mix thoroughly. Add cilantro and hold at serving temperature