In a large self-closing bag, combine chicken, flour, red curry powder and garlic salt. Shake to coat well.
Heat oil in a large nonstick skillet. Add chicken cubes and saute until well browned, 3 to 5 minutes. Reduce heat, add apples and onions and cook 2 to 3 minutes. Stir in brown sugar, garam masala and coconut milk, simmer, covered, 10 minutes, stirring occasionally.
Serve over rice with preferred condiments.