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No one has seen matter or energy created. Changed, yes, but not created.

About ten years ago cosmologists discovered the expansion of the universe was accelerating. This was very profound as it means that, in order to fuel the acceleration, dark energy comes into existence as the universe expands (it's related to Einstein's cosmological constant). By virtue of the fact that 'empty' space has vacuum energy the accelerating expanding universe is, by definition, creating energy as it goes. New particles can be transformed from this energy.

Of course, I might be entirely wrong

From Scientific American ...

A dramatic discovery almost a decade ago motivated our study. Two different groups of astronomers traced the expansion of the universe over the past five billion years and found that it appears to be speeding up. The source of this cosmic antigravity is thought to be some new form of "dark energy" associated with empty space. Some theorists, including one of us (Krauss), had actually anticipated this new result based on indirect measurements, but in physics it is direct observations that count. The acceleration of the universe implies that empty space contains almost three times as much energy as all the cosmic structures we observe today: galaxies, clusters and superclusters of galaxies. Ironically, Albert Einstein first postulated such a form of energy to keep the universe static. He called it the cosmological constant [see "Cosmological Antigravity," by Lawrence M. Krauss; Scientific American, January 1999].

I presume that when space is created by the expansion it comes with energy referred to above.