  Non-covalent interactions (NCIs) play a crucial role in biology, chemistry,
material science, and everything in between. To improve pure quantum-chemical
simulations of NCIs, we propose a methodology for constructing approximate
correlation energies by combining an interpolation along the M{\o}ller
adiabatic connection (MP AC) with a regularization and spin-scaling strategy
applied to MP2 correlation energies. This combination yields $c_{\rm
os}\kappa_{\rm os}$-SPL2, which exhibits superior accuracy for NCIs compared to
any of the individual strategies. With the $N^4$ formal scaling, $c_{\rm
os}\kappa_{\rm os}$-SPL2, is competitive or often outperforms more expensive
dispersion-corrected double hybrids for NCIs.The accuracy of $c_{\rm
os}\kappa_{\rm os}$-SPL2 particularly shines for anionic halogen bonded
complexes, where it surpasses standard dispersion-corrected DFT by a factor of
3 to 5.
