coli_ cells [9]. An excellent example is an earlier work carried out by the authors [11], who analyzed the antibacterial effect of a methyl-hydroxy-propyl-cellulose (MHPC) active layer (G) containing 5% of geraniol in the coating carrier. The authors observed a 3-log reduction in the number of _S. aureus_ cells, a 4-log reduction in the number of _E. coli_ cells, and a 2-log reduction in the number of _P. syringae_ cells. It should also be underlined that a characteristic aroma of geraniol in the active layer was noticeable. The findings of the previous work demonstrated that a decrease in the amount of geraniol (by 99.75%) in the MHPC carrier (G1) had a significant effect on the activity of the coating G1 against Gram-positive and Gram-negative strains. This coating slightly decreased the number of _S. aureus_ strains (1 log). The G1 layer was found not to be active against _E. coli_ and _P. syringae_ cells; however, a lowering of the ascent of the coating G1 compared to G was observed. The authors confirmed [12] that the coating containing 0.082 g of ZnO nanoparticles in 100 mL of MHPC carrier inhibited the growth of both Gram-positive and Gram-negative bacteria. The results of an earlier study [11] confirmed that the addition of the 0.041 g of nanoparticles (decreased amount) to the 100 mL of MHPC carrier containing 0.0125 g of geraniol (decreased amount comparedto the MHPC containing 5% of geraniol) led to obtaining the active layer, which inhibited the growth of _S. aureus_ cells. Additionally, a 4-log reduction in the number of _E. coli_ and _P. syringae_ cells was noticed. Zinc oxide nanoparticles are widely used as antimicrobial agents. They have ideal properties such as biocompatibility, high safety, long-term efficiency, stability, and an uncomplicated production process, making them a proper option for active coatings/packaging applications. Additionally, the US Food and Drug Administration (FDA) has affirmed the safety of these nanoparticles [12; 13]. The antibacterial activity of ZnO NPs against different bacterial strains such as Gram-negative _Klebsiella_ sp., _E. coli_, and Gram-positive _S. aureus_, including its AMR variant (MRSA), vancomycin-resistant enterococci, and _B. subtilis_, was confirmed [12; 13; 14; 15; 16; 17; 18; 19]. The various advantages of ZnO NPs may be attributed to their unique features, including their semiconducting behavior, high transparency in the visible light range, and high UV absorption capabilities. Ultraviolet radiation can lead to a degradation in the antimicrobial activity of packaging coverings by inactivation of the active agent introduced into the coating. The addition of an active agent which is resistant to UV in an active layer, or the addition of a substance with shielding properties, may prevent inactivation of the antimicrobial layer after UV irradiation [12; 14; 17; 18; 19]. As an assumption [11; 12], it may be concluded that the addition of ZnO nanoparticles into the _F. betulina_ or _U. tomentosa_ (separately) extracts can lead to a synergistic effect between these plant extracts and nanoparticles, and as a result, it may increase their antibacterial activity. The coatings containing nano ZnO as an additive will be resistant to ultraviolet irradiation due to their UV-shielding properties; they will maintain the plant extract's active compound effectiveness [12; 17; 18; 19]. The first purpose of the work was to obtain coatings based on _F. betulina_ and _U. tomentosa_ extracts with the addition of a decreased number of nanoparticles of ZnO (to 0.021 g per 100 mL of coating carrier) that could be active against selected Gram-positive and Gram-negative bacterial strains. The ZnO nanoparticles were used as a synergetic agent to increase plant extracts' antimicrobial activity and to prevent their inactivation when added to the coatings. Another aim of the study was to determine the influence of packaging covered with the obtained active layers on the microbial purity and texture of the sliced cooked ham.