How our mood while offering food to Krishna?, what prayers we need to chant everything is given as below….
Preparing and offering food to the Lord shows Him our devotion and gratitude. Krishna doesn't need to eat, of course, but He accepts the love with which we offer food to Him. As far as possible, use fresh, natural ingredients for cooking. Krishna accepts only vegetarian food, and packaged, store-bought products may contain meat, fish, or eggs. So read labels carefully.
Cleanliness is important in cooking for Krishna. Wash your hands before you begin. And don’t taste the food while cooking; the meal is for Krishna’s pleasure, so He should taste it first. It’s best to have a new set of dinnerware used only for Krishna’s offerings and not used by anyone else.
Place the plate in front of Krishna and ask Him to accept the offering. Then, in a mood of assisting the pure devotees, offer the preparations to Krishna while reciting the following prayers:
Prayers for Offering Food to Krishna:
nama oḿ viṣṇu-pādāya kṛṣṇa-preṣṭhāya bhū-tale
śrīmate bhaktivedānta-svāmin iti nāmine
namas te sārasvate deve gaura-vāṇī-pracāriṇe
nirviśeṣa-śūnyavādi-pāścātya-deśa-tāriṇe
(Please chant 3 times same mantra)
namo mahā-vadānyāya kṛṣṇa-prema-pradāya te
kṛṣṇāya kṛṣṇa-caitanya-nāmne gaura-tviṣe namaḥ
(Please chant 3 times same mantra)
namo brahmaṇya-devāya
go-brāhmaṇa-hitāya ca
jagad-dhitāya kṛṣṇāya
govindāya namo namaḥ
(Please chant 3 times same mantra)
(jaya) śrī-kṛṣṇa-caitanya prabhu nityānanda
śrī-advaita gadādhara śrīvāsādi-gaura-bhakta-vṛnda
hare kṛṣṇa hare kṛṣṇa kṛṣṇa kṛṣṇa hare hare
hare rāma hare rāma rāma rāma hare hare
Leave the plate there for a few minutes, just as you would if a loved one was eating.
Remove the plate, transfer the food to a serving plate, and wash Krishna’s dinnerware. The food is now prasadam, or “mercy” from Krishna. While you eat, consider the spiritual value of the food; because Krishna has accepted it, it is spiritually identical to Him. Therefore by eating prasadam you become purified.