Questions & Answers about Mor lager ferske kjeks i kveld.
Lager is the present tense (presens) of the verb å lage (“to make”). In Bokmål it’s a regular verb, so you form the present by adding -r to the infinitive stem:
• Infinitive: å lage
• Stem: lag-
• Present: lager
Adjectives in Norwegian agree in number and definiteness. Here kjeks is in indefinite plural (“cookies”), so the adjective takes the plural ending -e:
• Singular indefinite: en fersk kjeks
• Plural indefinite: ferske kjeks
If it were definite plural you’d also use -e on the adjective but add the noun ending: de ferske kjeksene.