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We present the first search for $z\geqslant7$, continuum-confirmed sourceswith NIRISS/WFS spectroscopy over the Abell 2744 Frontier Fields cluster, aspart of the GLASS-JWST ERS survey. With $\sim15$ hrs of pre-imaging andmulti-angle grism exposures in the F115W, F150W, and F200W filters, we describethe general data handling (i.e., reduction, cleaning, modeling, and extractionprocesses) and analysis for the GLASS-JWST survey. We showcase the power ofJWST to peer deep into reionization, when most intergalactic hydrogen isneutral, by confirming two galaxies at $z=8.04\pm0.15$ and $z=7.90\pm0.13$ bymeans of their Lyman breaks. Fainter continuum spectra are observed in both theF150W and F200W bands, indicative of blue ($-1.69$ and $-1.33$) UV slopes andmoderately-bright absolute magnitudes ($-20.37$ and $-19.68$ mag). We do notdetect strong Ly$\alpha$ in either galaxy, but do observe tentative($\sim2.7-3.8\sigma$) HeII$\lambda$1640 A, OIII]$\lambda\lambda$1661,1666 A,and NIII]$\lambda\lambda$1747,1749 A line emission in one, suggestive of lowmetallicity, star-forming systems with possible non-thermal contributions.These novel observations provide a first look at the extraordinary potential ofJWST/NIRISS for confirming representative samples of bright $z\geqslant7$sources in the absence of strong emission lines, and gain unprecedented insightinto their contributions towards cosmic reionization.

Early Results from GLASS-JWST. I: Confirmation of Lensed $z\geqslant7$ Lyman-Break Galaxies Behind the Abell 2744 Cluster With NIRISS