For upvas pārṇā (breaking the fast), there is no single fixed “only this” mantra in all Jain traditions. Most families do this simple and safe method:

1. Sit calmly (preferably near Jin mandir or in a clean place).
2. Recite Navkar Mantra with full devotion:

``` णमो अरिहंताणं । णमो सिद्धाणं । णमो आयरियाणं । णमो उवज्झायाणं । णमो लोए सव्वसाहूणं ॥ ```

1. After Navkar, many also say:

“मिच्छामि दुक्कडं” (arth: जो भी अशुभ हो गया हो, वह व्यर्थ हो जाए; सब मुझसे प्रसन्न रहें।)

1. In some families, especially after longer fasts, people also say in their own words:

- “आज के उपवास में अगर कोई भूल हो गई हो तो क्षमा करना।” - Then remember Arihant, Siddha, Āchārya, Upādhyāya, Sādhu‑sādhviji in mind.

1. Then slowly do pārṇā

- First take थोड़े गुनगुने उबाले हुए पानी के सिप - Then very हल्का, साधारण भोजन (जैसे पेय/खिचड़ी), धीरे‑धीरे, शांत मन से।

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Small notes (Digambar / Shwetambar)

• Both sects: Navkar Mantra is completely common and best for pārṇā.
• Extra shlok, stavan etc. can be added as per your family / guru / sangh – but Navkar + Micchhāmi Dukkaḍaṃ is always appropriate.

You can read a simple explanation about mantra for breaking fast here