Season Chicken: Add all the ingredients mentioned above in the "seasonings for chicken" into a large bowl, whisk to mix well. Throw in the chicken drumsticks and coat them well with this seasonings mixture. Set them aside.
Marinate Potatoes: Rinse and drain the baby potatoes and keep them in a large bowl. Now, throw in the onion & garlic. Add olive oil and everything mentioned in the "For marinating baby potatoes" section above. Coat the potatoes and onion with the seasonings and allow to marinate until you are done searing the chicken.
Sear Chicken: Set the instant pot on SAUTE & set it on HIGH heat, add oil. When the oil becomes moderately hot gently release the seasoned chicken drumsticks one by one and sear them until they turn golden around the edges and develop some brown spots. This will add so much flavor to the dish! Set them aside once they are seared well.
Deglaze pot: Pour the water and deglaze the pot very well by scraping the sides and the bottom of the pot with the help of a spatula. This will help loosen any stuck food particles and hence prevent the BURN error! DO NOT rush this step. Also add the lemon juice now.
Layer Potatoes and Chicken: Cancel the SAUTE mode. Transfer the marinated potatoes and onion into the instant pot. Spread them into a single layer. DO NOT mix or stir. Now, transfer the seared chicken drumsticks and stack or layer them in a single layer. DO NOT stir or mix.
Pressure Cook: Secure the lid of the instant pot, seal the vent. PRESSURE COOK on HIGH for just 4 mins. Once the cooking cycle is over the instant pot will begin to beep. Immediately perform a quick pressure release by moving the valve from the sealing to the venting position. Open the lid carefully when the metal pin on top of the lid drops.
Serve: Serve the pressure cooked chicken drumsticks and the baby potatoes on a plate and pour the bonus sauce from the instant pot all over the chicken and the potatoes. Garnish with chopped parsley and enjoy!