In medium skillet, sauté bell pepper and onions in oil until lightly browned. Stir in SPAM® and chili powder until well mixed.
For each omelette, in bowl, beat together 2 eggs, 1 tablespoon milk, 1/8 teaspoon salt and black pepper.
In 8- or 9-inch omelette pan or skillet, melt 1 teaspoon butter; pour in egg mixture. Cook over medium heat, pushing cooked edge of omelette to center as egg sets and tilting pan to allow uncooked mixture to run to edge.
When surface of omelette is set, spoon 1/2 cup SPAM® mixture on 1/2 of omelette; flip uncovered half over filling. Cook until bottom of omelette is browned.