Create chunks from an array

05AB1E, 1 byte

ô

Try it online or verify all test cases.

Builtins ftw. :)

JavaScript (ES6), 36 bytes

Takes input as (n)(array).

n=>g=a=>a+a&&[a.splice(0,n),...g(a)]

Try it online!

Commented

n =>                  // n = chunk size
  g = a =>            // g = recursive function taking the array a[]
    a + a             // if a[] is empty, stop recursion and return an empty string
    &&                // otherwise, return an array made of:
    [ a.splice(0, n), //   the next chunk
      ...g(a)         //   followed by the result of a recursive call
    ]                 //   (the last call leads to ...'', which adds nothing)

APL (Dyalog Unicode), 12 bytes^SBCS

⊢⊂⍨(⍴⊢)⍴1↑⍨⊣

Big thanks to Adám for basically doing basically all the golfing (and for basically all the APL knowledge I have currently >_>).

Explanation

 ⊂⍨           Partitioned enclose (commuted, i.e. left and right switched) - for each ⍵ in left, ⍺ in right, if ⍺ = 0, create a new sub-array, push ⍵ to latest sub-array
⊢             Right argument of entire expression
       ⍴      Reshape - Change size of right into dimensions specified by left
   (⍴ )       Shape of (here, there is only one dimension - length)
     ⊢        Right argument of entire expression
         ↑⍨   Take (commuted) - takes ⍺ elements from left where ⍺ is right. Extra elements (zeroes here) are automatically added
        1     1
           ⊣  Left argument of entire expression

Execution

Arguments 2, 1 2 3 4 5 6 7. Note that APL arrays are of the form a b c, with optional surrounding parentheses.

           ⊣  2
        1     1
         ↑⍨   1↑2 = 1 0
     ⊢        1 2 3 4 5 6 7
   (⍴ )       ⍴1 2 3 4 5 6 7 = 7
       ⍴      7⍴1 0 = 1 0 1 0 1 0 1
⊢             1 2 3 4 5 6 7
 ⊂⍨           1 0 1 0 1 0 1⊂1 2 3 4 5 6 7 = (1 2)(3 4)(5 6)(7)

Try it online!