The Sweetest Christmas (2017) on Netflix

Plot summary

Kylie Watson is a pastry chef who hopes to open a cafe of her own. She expects a proposal from her boyfriend, who is also her boss, and gets a promotion instead. Then she learns she has been chosen as a finalist in the American Gingerbread Competition, which would bring the publicity her new business needs, but the oven she means to use fails just before the contest. She asks Nick Mazannti, an old boyfriend from culinary school who set aside his own pastry ambitions to run his family's pizzeria, for help, and he offers her his pizza oven at night. The two work side by side after the restaurant closes, revisiting the plans they once made.