Heat 1 tablespoon olive oil in a large skillet over medium heat. Add chicken, onion, garlic, and ginger. Cook until lightly browned and cooked through, about 7 minutes. Remove from skillet and set aside.
Add pumpkin, curry, cumin, sugar, salt, turmeric, and cayenne to same skillet. Stir to blend and cook until fragrant, about 1 minute.
Add chicken broth, coconut milk, half-and-half, frozen vegetables, and cooked chicken. Bring to a boil over high heat, cover, and reduce to simmer. Cook 12 minutes or until sauce has thickened.
Serve warm chicken and curry mixture over brown rice, garnish with cilantro. To kick up the heat, add more cayenne spice.
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