Turn the Instant Pot to “Sauté” mode and add 2 tablespoons oil.
Add minced 3 teaspoons garlic and 1 small onion, sautéing for 2–3 minutes until fragrant and softened.
Add diced 1/2 pound chicken breast to the pot. Stir and sauté until lightly browned but not fully cooked.
Pour in the 1 cup Basmati rice, 1 1/ cup chicken broth, and 1/4 cup soy sauce. Stir everything together, making sure the rice is evenly coated and not sticking to the bottom.
Seal the Instant Pot lid, set to “Manual” or “Pressure Cook” for 6 minutes on high.
Once cooking is complete, carefully quick release the pressure. Stir in the 1 cup frozen vegetables. The residual heat will warm them through without overcooking.
Push the rice to one side of the pot and crack the 1 large egg into the empty side. Stir gently until the egg is cooked, then mix it evenly into the rice.