The phrase "tost one cookies" could be replaced with a number of synonyms depending on the context and tone. For a more informal and playful tone, one could use "toast up some cookies" or "crisp up some cookies." For a more formal tone, "toast the cookies" or "brown the cookies" would be appropriate. Alternatives for the word "cookies" could include "biscuits," "sweets," or "treats." Adding adjectives such as "golden," "crunchy," or "toasty" could also enhance the description of the baked goods. Ultimately, the synonym choices depend on the desired tone and context of the text.